Any file upload does not work

[iclou]

Hi
Freshly installed NodeBB 1.13.3 on Ubuntu 18.04.
All works fine but uploading any file (category, logo, etc) gives the following error in the UI:
"invalid-files"

In the log the error is as following:
"...
Error: [[error:invalid-files]]
at validateFiles (/home/<user>/nodebb/src/middleware/index.js:107:15)
at Layer.handle [as handle_request] (/home/<user>/nodebb/node_modules/express/lib/router/layer.js:95:5)
at next (/home/<user>/nodebb/node_modules/express/lib/router/route.js:137:13)
at Form.<anonymous> (/home/<user>/nodebb/node_modules/connect-multiparty/index.js:114:7)
at Form.emit (events.js:315:20)
at emitCloseNT (internal/streams/destroy.js:81:10)
at processTicksAndRejections (internal/process/task_queues.js:83:21)

..."

[baris]

Make sure you are not using nodejs 14.x

[iclou]

nodejs --version
v14.2.0

Ok, what shall I do now - downgrade nodejs?

[iclou]

ok, I just did a downgrade - now all works fine !!

nodejs --version
v13.14.0