Despite files being there, ethercalc shows no files in _roomlinks

[wiwwo]

Hi!
latest local copy of ethercalc
local directory:

-rw-rw-r-- 1 etherpad etherpad 61309 Jan 24 10:37 audit-sheet1.txt
-rw-rw-r-- 1 etherpad etherpad  9844 Jan 24 11:27 audit-sheet2.txt
-rw-rw-r-- 1 etherpad etherpad   642 Jan 24 10:37 snapshot-sheet1_formdata.txt
-rw-rw-r-- 1 etherpad etherpad  9482 Jan 24 10:37 snapshot-sheet1.txt
-rw-rw-r-- 1 etherpad etherpad  6216 Jan 24 11:30 snapshot-sheet2.txt

but no files shown in _roomlinks.
Lockily the files seem (?) to have their content, so no work lost hopefully.
But, what is going on?

[wiwwo]

p.s.: etherpad user is not a typo.

On a plus note: nothing changed, and suddenly it stopped working.

How do i get meaningful logs?
Which are ethercalc command line options?

[wiwwo]

Only logging i can get:

Please connect to: http://127.0.0.1:8001/
Starting backend using webworker-threads
Falling back to vm.CreateContext backend
Express server listening on port 8001 in production mode
Zappa 0.5.0 "You can't do that on stage anymore" orchestrating the show
Error: Redis connection to localhost:6379 failed - connect ECONNREFUSED 127.0.0.1:6379
    at RedisClient.on_error (/usr/lib/node_modules/ethercalc/node_modules/redis/index.js:196:24)
    at Socket.<anonymous> (/usr/lib/node_modules/ethercalc/node_modules/redis/index.js:106:14)
    at Socket.emit (events.js:314:20)
    at emitErrorNT (internal/streams/destroy.js:92:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:60:3)
    at processTicksAndRejections (internal/process/task_queues.js:84:21)

==> Falling back to file system storage: /opt/ethercalc-docs/dump/
(node:731) [DEP0066] DeprecationWarning: OutgoingMessage.prototype._headers is deprecated