When using SPC as leader in all states, a strange error happens when opening new files.

[zeroDivisible]

Hey guys.

In my emacs.org, I've got the following configuration:

(evil-leader/set-leader "<SPC>")
(setq evil-leader/in-all-states t)
(evil-mode nil)
(global-evil-leader-mode)
(evil-mode 1)

I needed to use it like that as without the extra (evil-mode nil), leader wasn't bound in *Messages* buffer. I found the solution in #10

This works as expected, binding leader in *Messages* (which is ultimately what I'm trying to achieve), however, when opening new i.e Yaml buffer, I'm getting the following error message:

File mode specification error: (error "To bind the key C-SPC, use [?\\C- ], not [C-SPC]")
progn: To bind the key C-SPC, use [?\C- ], not [C-SPC]

The full and lengthy stacktrace which I'm getting with this is:

Debugger entered--Lisp error: (error "To bind the key C-SPC, use [?\\C- ], not [C-SPC]")
  define-key((keymap (67108896 keymap (119 keymap (61 . balance-windows) (114 . toggle-window-split)) (64 . google-this-noconfirm) (27 . ace-jump-mode-pop-mark) (33 . google-this-search) (83 . helm-org-agenda-files-headings) (111 keymap (116 keymap (116 . org-set-tags)) (112 . org-iswitchb) (115 . org-schedule) (111 . org-open-at-point) (110 keymap (110 . org-add-note)) (76 . org-insert-link-global) (108 . org-store-link) (103 . helm-multi-swoop-org) (101 . org-edit-special) (100 . org-deadline) (99 keymap (113 . org-clock-cancel) (111 . org-clock-out) (99 . org-clock-in))) (116 . org-todo) (115 . helm-semantic-or-imenu) (98 keymap (100 . bookmark-delete) (108 . helm-bookmarks) (98 . bookmark-jump) (97 . bookmark-set)) (112 keymap (100 . projectile-dired) (115 . helm-projectile-switch-project) (102 . helm-projectile-find-file-dwim) (114 . helm-projectile-recentf) (107 . helm-projectile-find-file-in-known-projects) (112 . helm-projectile-find-file)) (104 keymap (109 . helm-man-woman) (63 . help-for-help) (100 . helm-dash-at-point) (71 . helm-do-ag) (103 . helm-projectile-ag) (105 . helm-imenu) (102 . helm-for-files) (98 . helm-bookmarks)) (102 . helm-find-files) (32 . helm-mini) (42 . helm-swoop-from-evil-search) (47 . helm-swoop) (63 . helm-descbinds) (103 keymap (116 . magit-diff-working-tree) (118 . vc-revision-other-window) (109 . magit-branch-popup) (110 keymap (98 . magit-create-branch)) (99 . magit-commit) (76 . magit-file-log) (108 . magit-log) (115 . magit-status) (98 . magit-blame-mode) (97 . vc-annotate)) (45 . helm-flycheck) (113 . delete-window) (49 . delete-other-windows) (100 . dired))) [C-SPC] (keymap (119 keymap (61 . balance-windows) (114 . toggle-window-split)) (64 . google-this-noconfirm) (27 . ace-jump-mode-pop-mark) (33 . google-this-search) (83 . helm-org-agenda-files-headings) (111 keymap (116 keymap (116 . org-set-tags)) (112 . org-iswitchb) (115 . org-schedule) (111 . org-open-at-point) (110 keymap (110 . org-add-note)) (76 . org-insert-link-global) (108 . org-store-link) (103 . helm-multi-swoop-org) (101 . org-edit-special) (100 . org-deadline) (99 keymap (113 . org-clock-cancel) (111 . org-clock-out) (99 . org-clock-in))) (116 . org-todo) (115 . helm-semantic-or-imenu) (98 keymap (100 . bookmark-delete) (108 . helm-bookmarks) (98 . bookmark-jump) (97 . bookmark-set)) (112 keymap (100 . projectile-dired) (115 . helm-projectile-switch-project) (102 . helm-projectile-find-file-dwim) (114 . helm-projectile-recentf) (107 . helm-projectile-find-file-in-known-projects) (112 . helm-projectile-find-file)) (104 keymap (109 . helm-man-woman) (63 . help-for-help) (100 . helm-dash-at-point) (71 . helm-do-ag) (103 . helm-projectile-ag) (105 . helm-imenu) (102 . helm-for-files) (98 . helm-bookmarks)) (102 . helm-find-files) (32 . helm-mini) (42 . helm-swoop-from-evil-search) (47 . helm-swoop) (63 . helm-descbinds) (103 keymap (116 . magit-diff-working-tree) (118 . vc-revision-other-window) (109 . magit-branch-popup) (110 keymap (98 . magit-create-branch)) (99 . magit-commit) (76 . magit-file-log) (108 . magit-log) (115 . magit-status) (98 . magit-blame-mode) (97 . vc-annotate)) (45 . helm-flycheck) (113 . delete-window) (49 . delete-other-windows) (100 . dired)))
  (progn (define-key evil-emacs-state-local-map prefixed map) (define-key evil-insert-state-local-map prefixed map))
  (if evil-leader/in-all-states (progn (define-key evil-emacs-state-local-map prefixed map) (define-key evil-insert-state-local-map prefixed map)))
  (progn (evil-normalize-keymaps) (define-key evil-motion-state-local-map no-prefix map) (define-key evil-normal-state-local-map no-prefix map) (if evil-leader/in-all-states (progn (define-key evil-emacs-state-local-map prefixed map) (define-key evil-insert-state-local-map prefixed map))) (if (and no-prefix-rx (string-match-p no-prefix-rx (symbol-name major-mode))) (progn (define-key evil-emacs-state-local-map no-prefix map) (define-key evil-insert-state-local-map no-prefix map))))
  (if evil-leader-mode (progn (evil-normalize-keymaps) (define-key evil-motion-state-local-map no-prefix map) (define-key evil-normal-state-local-map no-prefix map) (if evil-leader/in-all-states (progn (define-key evil-emacs-state-local-map prefixed map) (define-key evil-insert-state-local-map prefixed map))) (if (and no-prefix-rx (string-match-p no-prefix-rx (symbol-name major-mode))) (progn (define-key evil-emacs-state-local-map no-prefix map) (define-key evil-insert-state-local-map no-prefix map)))) (define-key evil-motion-state-local-map no-prefix nil) (define-key evil-normal-state-local-map no-prefix nil) (if evil-leader/in-all-states (progn (define-key evil-emacs-state-local-map prefixed nil) (define-key evil-insert-state-local-map prefixed nil) (if (and no-prefix-rx (string-match-p no-prefix-rx (symbol-name major-mode))) (progn (define-key evil-emacs-state-local-map no-prefix nil) (define-key evil-insert-state-local-map no-prefix nil))))))
  (let* ((prefixed (read-kbd-macro (concat evil-leader/non-normal-prefix evil-leader/leader))) (no-prefix (read-kbd-macro evil-leader/leader)) (mode-map (cdr (assoc major-mode evil-leader--mode-maps))) (map (or mode-map evil-leader--default-map)) (no-prefix-rx (if evil-leader/no-prefix-mode-rx (mapconcat (function identity) evil-leader/no-prefix-mode-rx "\\|") nil))) (if evil-leader-mode (progn (evil-normalize-keymaps) (define-key evil-motion-state-local-map no-prefix map) (define-key evil-normal-state-local-map no-prefix map) (if evil-leader/in-all-states (progn (define-key evil-emacs-state-local-map prefixed map) (define-key evil-insert-state-local-map prefixed map))) (if (and no-prefix-rx (string-match-p no-prefix-rx (symbol-name major-mode))) (progn (define-key evil-emacs-state-local-map no-prefix map) (define-key evil-insert-state-local-map no-prefix map)))) (define-key evil-motion-state-local-map no-prefix nil) (define-key evil-normal-state-local-map no-prefix nil) (if evil-leader/in-all-states (progn (define-key evil-emacs-state-local-map prefixed nil) (define-key evil-insert-state-local-map prefixed nil) (if (and no-prefix-rx (string-match-p no-prefix-rx (symbol-name major-mode))) (progn (define-key evil-emacs-state-local-map no-prefix nil) (define-key evil-insert-state-local-map no-prefix nil)))))))
  (let ((last-message (current-message))) (setq evil-leader-mode (if (eq arg (quote toggle)) (not evil-leader-mode) (> (prefix-numeric-value arg) 0))) (let* ((prefixed (read-kbd-macro (concat evil-leader/non-normal-prefix evil-leader/leader))) (no-prefix (read-kbd-macro evil-leader/leader)) (mode-map (cdr (assoc major-mode evil-leader--mode-maps))) (map (or mode-map evil-leader--default-map)) (no-prefix-rx (if evil-leader/no-prefix-mode-rx (mapconcat (function identity) evil-leader/no-prefix-mode-rx "\\|") nil))) (if evil-leader-mode (progn (evil-normalize-keymaps) (define-key evil-motion-state-local-map no-prefix map) (define-key evil-normal-state-local-map no-prefix map) (if evil-leader/in-all-states (progn (define-key evil-emacs-state-local-map prefixed map) (define-key evil-insert-state-local-map prefixed map))) (if (and no-prefix-rx (string-match-p no-prefix-rx (symbol-name major-mode))) (progn (define-key evil-emacs-state-local-map no-prefix map) (define-key evil-insert-state-local-map no-prefix map)))) (define-key evil-motion-state-local-map no-prefix nil) (define-key evil-normal-state-local-map no-prefix nil) (if evil-leader/in-all-states (progn (define-key evil-emacs-state-local-map prefixed nil) (define-key evil-insert-state-local-map prefixed nil) (if (and no-prefix-rx (string-match-p no-prefix-rx ...)) (progn (define-key evil-emacs-state-local-map no-prefix nil) (define-key evil-insert-state-local-map no-prefix nil))))))) (run-hooks (quote evil-leader-mode-hook) (if evil-leader-mode (quote evil-leader-mode-on-hook) (quote evil-leader-mode-off-hook))) (if (called-interactively-p (quote any)) (progn nil (if (and (current-message) (not (equal last-message (current-message)))) nil (message "Evil-Leader mode %sabled" (if evil-leader-mode "en" "dis"))))))
  evil-leader-mode()
  run-hooks(evil-local-mode-hook evil-local-mode-off-hook)
  (let ((last-message (current-message))) (setq evil-local-mode (if (eq arg (quote toggle)) (not evil-local-mode) (> (prefix-numeric-value arg) 0))) (cond ((evil-disabled-buffer-p)) (evil-local-mode (setq emulation-mode-map-alists (evil-concat-lists (quote (evil-mode-map-alist)) emulation-mode-map-alists)) (evil-initialize-local-keymaps) (if (eq major-mode (quote turn-on-evil-mode)) (progn (setq major-mode (quote fundamental-mode)))) (if evil-state nil (evil-initialize-state)) (add-hook (quote input-method-activate-hook) (quote evil-activate-input-method) t t) (add-hook (quote input-method-deactivate-hook) (quote evil-deactivate-input-method) t t) (add-hook (quote activate-mark-hook) (quote evil-visual-activate-hook) nil t) (add-hook (quote pre-command-hook) (quote evil-repeat-pre-hook)) (add-hook (quote pre-command-hook) (quote evil-jump-hook) nil t) (add-hook (quote post-command-hook) (quote evil-repeat-post-hook))) (t (evil-refresh-mode-line) (remove-hook (quote pre-command-hook) (quote evil-jump-hook) t) (remove-hook (quote activate-mark-hook) (quote evil-visual-activate-hook) t) (remove-hook (quote input-method-activate-hook) (quote evil-activate-input-method) t) (remove-hook (quote input-method-deactivate-hook) (quote evil-deactivate-input-method) t) (evil-change-state nil))) (run-hooks (quote evil-local-mode-hook) (if evil-local-mode (quote evil-local-mode-on-hook) (quote evil-local-mode-off-hook))) (if (called-interactively-p (quote any)) (progn nil (if (and (current-message) (not (equal last-message (current-message)))) nil (message "Evil-Local mode %sabled" (if evil-local-mode "en" "dis"))))))
  evil-local-mode(-1)
  (progn (evil-local-mode -1) (funcall (function evil-initialize)))
  (if evil-local-mode (progn (evil-local-mode -1) (funcall (function evil-initialize))) (funcall (function evil-initialize)))
  (if (eq evil-local-mode-major-mode major-mode) nil (if evil-local-mode (progn (evil-local-mode -1) (funcall (function evil-initialize))) (funcall (function evil-initialize))))
  (if evil-local-mode-set-explicitly nil (if (eq evil-local-mode-major-mode major-mode) nil (if evil-local-mode (progn (evil-local-mode -1) (funcall (function evil-initialize))) (funcall (function evil-initialize)))))
  (save-current-buffer (set-buffer buf) (if evil-local-mode-set-explicitly nil (if (eq evil-local-mode-major-mode major-mode) nil (if evil-local-mode (progn (evil-local-mode -1) (funcall (function evil-initialize))) (funcall (function evil-initialize))))) (setq evil-local-mode-major-mode major-mode))
  (progn (save-current-buffer (set-buffer buf) (if evil-local-mode-set-explicitly nil (if (eq evil-local-mode-major-mode major-mode) nil (if evil-local-mode (progn (evil-local-mode -1) (funcall (function evil-initialize))) (funcall (function evil-initialize))))) (setq evil-local-mode-major-mode major-mode)))
  (if (buffer-live-p buf) (progn (save-current-buffer (set-buffer buf) (if evil-local-mode-set-explicitly nil (if (eq evil-local-mode-major-mode major-mode) nil (if evil-local-mode (progn (evil-local-mode -1) (funcall ...)) (funcall (function evil-initialize))))) (setq evil-local-mode-major-mode major-mode))))
  (while --dolist-tail-- (setq buf (car --dolist-tail--)) (if (buffer-live-p buf) (progn (save-current-buffer (set-buffer buf) (if evil-local-mode-set-explicitly nil (if (eq evil-local-mode-major-mode major-mode) nil (if evil-local-mode (progn ... ...) (funcall ...)))) (setq evil-local-mode-major-mode major-mode)))) (setq --dolist-tail-- (cdr --dolist-tail--)))
  (let ((--dolist-tail-- evil-mode-buffers) buf) (while --dolist-tail-- (setq buf (car --dolist-tail--)) (if (buffer-live-p buf) (progn (save-current-buffer (set-buffer buf) (if evil-local-mode-set-explicitly nil (if (eq evil-local-mode-major-mode major-mode) nil (if evil-local-mode ... ...))) (setq evil-local-mode-major-mode major-mode)))) (setq --dolist-tail-- (cdr --dolist-tail--))))
  evil-mode-enable-in-buffers()
  run-hooks(after-change-major-mode-hook)
  run-mode-hooks(yaml-mode-hook)
  yaml-mode()
  set-auto-mode-0(yaml-mode nil)
  set-auto-mode()
  normal-mode(t)
  after-find-file(nil t)
  find-file-noselect-1(#<buffer main.yml<skylake>> "~/b-box/ansible/roles/skylake/tasks/main.yml" nil nil "~/b-box/ansible/roles/skylake/tasks/main.yml" (10354841 2052))
  find-file-noselect("/home/zerodi/b-box/ansible/roles/skylake/tasks/main.yml" nil nil nil)
  find-file("/home/zerodi/b-box/ansible/roles/skylake/tasks/main.yml")
  mapc(find-file ("/home/zerodi/b-box/ansible/roles/skylake/tasks/main.yml"))
  (let ((helm--reading-passwd-or-string t)) (mapc (quote find-file) (helm-marked-candidates)))
  helm-find-many-files("/home/zerodi/b-box/ansible/roles/skylake/tasks/main.yml")
  funcall(helm-find-many-files "/home/zerodi/b-box/ansible/roles/skylake/tasks/main.yml")
  (progn (funcall action selection))
  (if (and selection action) (progn (funcall action selection)))
  (let ((source (or helm-saved-current-source (helm-get-current-source))) non-essential) (setq selection (helm-coerce-selection (or selection helm-saved-selection (helm-get-selection) (and (assoc (quote accept-empty) source) "")) source)) (if preserve-saved-action nil (setq helm-saved-action nil)) (if (and selection action) (progn (funcall action selection))))
  helm-execute-selection-action-1()
  (unwind-protect (helm-execute-selection-action-1) (let ((it (get-buffer helm-action-buffer))) (if it (kill-buffer it))) (helm-log-run-hook (quote helm-after-action-hook)))
  helm-execute-selection-action()
  (if helm-quit nil (helm-execute-selection-action))
  (prog1 (if helm-quit nil (helm-execute-selection-action)) (helm-log (concat "[End session] " (make-string 41 45))))
  (let (helm-source-name helm-current-source helm-in-persistent-action helm-quit (helm-buffer (or any-buffer helm-buffer))) (let ((orig-vars57806 (mapcar (function (lambda (v) (cons v ...))) helm-restored-variables))) (unwind-protect (progn (helm-initialize any-resume any-input any-default any-sources) (helm-display-buffer helm-buffer) (if helm-prevent-escaping-from-minibuffer (progn (helm--remap-mouse-mode 1))) (add-hook (quote post-command-hook) (quote helm--maybe-update-keymap)) (add-hook (quote post-command-hook) (quote helm--update-header-line)) (helm-log "show prompt") (unwind-protect (helm-read-pattern-maybe any-prompt any-input any-preselect any-resume any-keymap any-default any-history) (helm-cleanup))) (let* ((--cl-var-- orig-vars57806) (value nil) (var nil)) (while (consp --cl-var--) (setq value (car --cl-var--) var (car-safe (prog1 value ...))) (set var value) (setq --cl-var-- (cdr --cl-var--))) nil) (helm-log "restore variables"))) (prog1 (if helm-quit nil (helm-execute-selection-action)) (helm-log (concat "[End session] " (make-string 41 45)))))
  (condition-case _v (let (helm-source-name helm-current-source helm-in-persistent-action helm-quit (helm-buffer (or any-buffer helm-buffer))) (let ((orig-vars57806 (mapcar (function (lambda ... ...)) helm-restored-variables))) (unwind-protect (progn (helm-initialize any-resume any-input any-default any-sources) (helm-display-buffer helm-buffer) (if helm-prevent-escaping-from-minibuffer (progn (helm--remap-mouse-mode 1))) (add-hook (quote post-command-hook) (quote helm--maybe-update-keymap)) (add-hook (quote post-command-hook) (quote helm--update-header-line)) (helm-log "show prompt") (unwind-protect (helm-read-pattern-maybe any-prompt any-input any-preselect any-resume any-keymap any-default any-history) (helm-cleanup))) (let* ((--cl-var-- orig-vars57806) (value nil) (var nil)) (while (consp --cl-var--) (setq value (car --cl-var--) var (car-safe ...)) (set var value) (setq --cl-var-- (cdr --cl-var--))) nil) (helm-log "restore variables"))) (prog1 (if helm-quit nil (helm-execute-selection-action)) (helm-log (concat "[End session] " (make-string 41 45))))) ((debug quit) (helm-restore-position-on-quit) (helm-log (concat "[End session (quit)] " (make-string 34 45))) nil))
  (unwind-protect (condition-case _v (let (helm-source-name helm-current-source helm-in-persistent-action helm-quit (helm-buffer (or any-buffer helm-buffer))) (let ((orig-vars57806 (mapcar (function ...) helm-restored-variables))) (unwind-protect (progn (helm-initialize any-resume any-input any-default any-sources) (helm-display-buffer helm-buffer) (if helm-prevent-escaping-from-minibuffer (progn ...)) (add-hook (quote post-command-hook) (quote helm--maybe-update-keymap)) (add-hook (quote post-command-hook) (quote helm--update-header-line)) (helm-log "show prompt") (unwind-protect (helm-read-pattern-maybe any-prompt any-input any-preselect any-resume any-keymap any-default any-history) (helm-cleanup))) (let* ((--cl-var-- orig-vars57806) (value nil) (var nil)) (while (consp --cl-var--) (setq value ... var ...) (set var value) (setq --cl-var-- ...)) nil) (helm-log "restore variables"))) (prog1 (if helm-quit nil (helm-execute-selection-action)) (helm-log (concat "[End session] " (make-string 41 45))))) ((debug quit) (helm-restore-position-on-quit) (helm-log (concat "[End session (quit)] " (make-string 34 45))) nil)) (if (fboundp (quote advice-add)) (progn (advice-remove (quote tramp-read-passwd) (function helm--advice-tramp-read-passwd)) (advice-remove (quote ange-ftp-get-passwd) (function helm--advice-ange-ftp-get-passwd))) (ad-deactivate (quote tramp-read-passwd)) (ad-deactivate (quote ange-ftp-get-passwd))) (helm-log "helm-alive-p = %S" (setq helm-alive-p nil)) (helm--remap-mouse-mode -1) (setq helm-alive-p nil) (setq helm-pattern "") (and old--cua (cua-mode 1)) (helm-log-save-maybe))
  (let ((non-essential t) (input-method-verbose-flag helm-input-method-verbose-flag) (old--cua cua-mode) (helm--maybe-use-default-as-input (and (null any-input) (or helm--maybe-use-default-as-input (let* ((--cl-var-- ...) (s nil) (--cl-flag-- t) --cl-var--) (while (and ... ...) (setq --cl-var-- ...)) --cl-var--))))) (and cua-mode (cua-mode -1)) (unwind-protect (condition-case _v (let (helm-source-name helm-current-source helm-in-persistent-action helm-quit (helm-buffer (or any-buffer helm-buffer))) (let ((orig-vars57806 (mapcar ... helm-restored-variables))) (unwind-protect (progn (helm-initialize any-resume any-input any-default any-sources) (helm-display-buffer helm-buffer) (if helm-prevent-escaping-from-minibuffer ...) (add-hook ... ...) (add-hook ... ...) (helm-log "show prompt") (unwind-protect ... ...)) (let* (... ... ...) (while ... ... ... ...) nil) (helm-log "restore variables"))) (prog1 (if helm-quit nil (helm-execute-selection-action)) (helm-log (concat "[End session] " (make-string 41 45))))) ((debug quit) (helm-restore-position-on-quit) (helm-log (concat "[End session (quit)] " (make-string 34 45))) nil)) (if (fboundp (quote advice-add)) (progn (advice-remove (quote tramp-read-passwd) (function helm--advice-tramp-read-passwd)) (advice-remove (quote ange-ftp-get-passwd) (function helm--advice-ange-ftp-get-passwd))) (ad-deactivate (quote tramp-read-passwd)) (ad-deactivate (quote ange-ftp-get-passwd))) (helm-log "helm-alive-p = %S" (setq helm-alive-p nil)) (helm--remap-mouse-mode -1) (setq helm-alive-p nil) (setq helm-pattern "") (and old--cua (cua-mode 1)) (helm-log-save-maybe)))
  helm-internal((helm-source-buffers-list helm-source-recentf helm-source-buffer-not-found) nil nil nil nil "*helm mini*" nil nil nil)
  apply(helm-internal ((helm-source-buffers-list helm-source-recentf helm-source-buffer-not-found) nil nil nil nil "*helm mini*" nil nil nil))
  (if (keywordp (car plist)) (progn (setq helm--local-variables (append helm--local-variables (helm-parse-keys plist))) (apply fn (mapcar (function (lambda (key) (plist-get plist key))) helm-argument-keys))) (apply fn plist))
  (if (and helm-alive-p (eq fn (function helm))) (if (helm-alive-p) (error "Error: Trying to run helm within a running helm session") (save-current-buffer (set-buffer (helm-buffer-get)) (prog1 (message "Aborting an helm session running in background") (helm-keyboard-quit)))) (if (keywordp (car plist)) (progn (setq helm--local-variables (append helm--local-variables (helm-parse-keys plist))) (apply fn (mapcar (function (lambda (key) (plist-get plist key))) helm-argument-keys))) (apply fn plist)))
  (let ((fn (cond ((or (and helm-alive-p (plist-get plist :allow-nest)) (and helm-alive-p (memq ... plist))) (function helm-nest)) ((keywordp (car plist)) (function helm)) (t (function helm-internal))))) (if (and helm-alive-p (eq fn (function helm))) (if (helm-alive-p) (error "Error: Trying to run helm within a running helm session") (save-current-buffer (set-buffer (helm-buffer-get)) (prog1 (message "Aborting an helm session running in background") (helm-keyboard-quit)))) (if (keywordp (car plist)) (progn (setq helm--local-variables (append helm--local-variables (helm-parse-keys plist))) (apply fn (mapcar (function (lambda ... ...)) helm-argument-keys))) (apply fn plist))))
  helm((helm-source-buffers-list helm-source-recentf helm-source-buffer-not-found) nil nil nil nil "*helm mini*" nil nil nil)
  apply(helm ((helm-source-buffers-list helm-source-recentf helm-source-buffer-not-found) nil nil nil nil "*helm mini*" nil nil nil))
  (progn (setq helm--local-variables (append helm--local-variables (helm-parse-keys plist))) (apply fn (mapcar (function (lambda (key) (plist-get plist key))) helm-argument-keys)))
  (if (keywordp (car plist)) (progn (setq helm--local-variables (append helm--local-variables (helm-parse-keys plist))) (apply fn (mapcar (function (lambda (key) (plist-get plist key))) helm-argument-keys))) (apply fn plist))
  (if (and helm-alive-p (eq fn (function helm))) (if (helm-alive-p) (error "Error: Trying to run helm within a running helm session") (save-current-buffer (set-buffer (helm-buffer-get)) (prog1 (message "Aborting an helm session running in background") (helm-keyboard-quit)))) (if (keywordp (car plist)) (progn (setq helm--local-variables (append helm--local-variables (helm-parse-keys plist))) (apply fn (mapcar (function (lambda (key) (plist-get plist key))) helm-argument-keys))) (apply fn plist)))
  (let ((fn (cond ((or (and helm-alive-p (plist-get plist :allow-nest)) (and helm-alive-p (memq ... plist))) (function helm-nest)) ((keywordp (car plist)) (function helm)) (t (function helm-internal))))) (if (and helm-alive-p (eq fn (function helm))) (if (helm-alive-p) (error "Error: Trying to run helm within a running helm session") (save-current-buffer (set-buffer (helm-buffer-get)) (prog1 (message "Aborting an helm session running in background") (helm-keyboard-quit)))) (if (keywordp (car plist)) (progn (setq helm--local-variables (append helm--local-variables (helm-parse-keys plist))) (apply fn (mapcar (function (lambda ... ...)) helm-argument-keys))) (apply fn plist))))
  helm(:sources (helm-source-buffers-list helm-source-recentf helm-source-buffer-not-found) :buffer "*helm mini*" :ff-transformer-show-only-basename nil :truncate-lines t)
  helm-mini()
  call-interactively(helm-mini nil nil)
  command-execute(helm-mini)

Strangely, if I try to open this file for a second time, it works as expected.

What would be the advised way of fixing this error and / or making leader work in *Messages* buffer?

Thanks!

[zeroDivisible]

A possible workaround which removes the need for the change from above is to set the initial state for *Messages* buffer to i.e. motion with:

            (evil-set-initial-state 'messages-buffer-mode 'motion)

However, the error from above still happens for me.

[mclearc]

I'm seeing a similar problem, and just for yaml files. This error didn't appear before I installed the yaml-mode package.

[HenryMarshall]

This also happens using sass-mode. I wonder if it is related to significant whitespace.

If you wind up here from google, I found that general behaves similarly to evil-leader, but does not have this issue (at least with sass).

[infinisil]

Fwiw the same problem happens with .cabal files and the haskell-mode package