Unable to activate locomotivecms_mounter-1.4.4

[nickdunn]

Hello all.

I've just tried installing Locomotive from scratch (following http://doc.locomotivecms.com/get-started/install-wagon#mac). I'm using RVM and already run a few Rails 4 apps locally.

After installing the gem I get an error from the mounter app:

$ sudo gem install locomotivecms_wagon
Fetching: daemons-1.1.9.gem (100%)
Successfully installed daemons-1.1.9
Fetching: thin-1.5.1.gem (100%)
Building native extensions.  This could take a while...
Successfully installed thin-1.5.1
Fetching: activesupport-3.2.19.gem (100%)
Successfully installed activesupport-3.2.19
Fetching: locomotivecms-liquid-2.6.0.gem (100%)
Successfully installed locomotivecms-liquid-2.6.0
Fetching: locomotivecms-solid-0.2.2.1.gem (100%)
Successfully installed locomotivecms-solid-0.2.2.1
Fetching: RedCloth-4.2.9.gem (100%)
Building native extensions.  This could take a while...
Successfully installed RedCloth-4.2.9
Fetching: dragonfly-0.9.15.gem (100%)
Successfully installed dragonfly-0.9.15
Fetching: listen-0.7.3.gem (100%)
Successfully installed listen-0.7.3
Fetching: multi_xml-0.5.5.gem (100%)
Successfully installed multi_xml-0.5.5
Fetching: httparty-0.13.1.gem (100%)
When you HTTParty, you must party hard!
Successfully installed httparty-0.13.1
Fetching: multipart-post-2.0.0.gem (100%)
Successfully installed multipart-post-2.0.0
Fetching: httmultiparty-0.3.10.gem (100%)
Successfully installed httmultiparty-0.3.10
Fetching: will_paginate-3.0.7.gem (100%)
Successfully installed will_paginate-3.0.7
Fetching: yui-compressor-0.12.0.gem (100%)
Successfully installed yui-compressor-0.12.0
Fetching: sass-3.4.5.gem (100%)
Successfully installed sass-3.4.5
Fetching: commonjs-0.2.7.gem (100%)
Successfully installed commonjs-0.2.7
Fetching: less-2.2.2.gem (100%)
Successfully installed less-2.2.2
Fetching: chronic-0.10.2.gem (100%)
Successfully installed chronic-0.10.2
Fetching: stringex-2.0.11.gem (100%)
Successfully installed stringex-2.0.11
Fetching: zip-2.0.2.gem (100%)
Successfully installed zip-2.0.2
Fetching: colorize-0.5.8.gem (100%)
Successfully installed colorize-0.5.8
Fetching: logger-1.2.8.gem (100%)
Successfully installed logger-1.2.8
Fetching: locomotivecms_mounter-1.4.4.gem (100%)
Successfully installed locomotivecms_mounter-1.4.4
Fetching: faker-0.9.5.gem (100%)
Successfully installed faker-0.9.5
Fetching: locomotivecms_wagon-1.4.0.gem (100%)
Successfully installed locomotivecms_wagon-1.4.0
25 gems installed

$ wagon version
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:2007:in `raise_if_conflicts': Unable to activate locomotivecms_mounter-1.4.4, because sprockets-sass-1.0.2 conflicts with sprockets-sass (~> 1.2.0) (Gem::LoadError)
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:1176:in `activate'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:1212:in `block in activate_dependencies'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:1198:in `each'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:1198:in `activate_dependencies'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:1180:in `activate'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_gem.rb:48:in `gem'
  from /usr/bin/wagon:22:in `<main>'

I have two versions of sprockets-sass installed:

$ gem list
...
sprockets-sass (1.2.0, 1.0.2)

I have tried then uninstalling locomotivecms_wagon and all versions of sprockets-sass. Then installing sprockets-sass 1.0.2 only, and then re-installing wagon. Same error.

$ wagon version
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:2007:in `raise_if_conflicts': Unable to activate locomotivecms_mounter-1.4.4, because sprockets-sass-1.0.3 conflicts with sprockets-sass (~> 1.2.0) (Gem::LoadError)

Any ideas?