Notes app: White screen

Hello,

I have installed the notes app 3…0.3 on NC17 on Debian Buster with PHP7.3, and nginx. The system works so far as I can log in, create files, and send chat messages.

When I go on notes I only get a white screen with the blue border on top. I cannot create any notes because the left side with the “add new note” etc. is completely missing. What can I do to investigate/solve the problem?

Thank you,
alex