Can't use Collabora on NextCloud

For installing Collabora on my Nextcloud instance, I used this guide :

Everything goes well until I try to create a new document because I have only an empty window as you can see :

What shall I do ?

I have a similar issue. I am seeing this in my javascript console:

bundle.js:1 Uncaught ReferenceError: Cursor is not defined
    at NewClass.initialize (bundle.js:1)
    at new NewClass (bundle.js:1)
    at (bundle.js:1)
    at bundle.js:1
    at bundle.js:1
    at bundle.js:1

Check the log of NC.
And the log of your webserver.

Did the apps install successfully?

We’ve exactly the same problem since upgrading our CODE server to version (from which brings LOOLWSD HTTP Server 6.4.13. I don’t see any problems neither in the Nextcloud nor in the CollaboraOnline server logs. Only the message about the undefined Cursor is shown in the browser console.

We are running NC 20.0.12 and the Collabora Online App 3.8.6.

What did you change? Did you update your Collabora Online server (like we did before we’ve run into the problem)? Which version of the Collabora Online App do you use in Nextcloud? Which version of Nextcloud do you run?

As we do encounter the same problem when accessing our CODE server from Moodle (instead of Nextcloud), I’ve filed a bug at the CODE project:

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I have read you’re answers and the links embeded but I think they’re not appropriate to my configuration.
I’ve got NextCloud and Collabora is installed from the Application menu and, at this time, Collabora is in version 4.2.3 and CODE in 6.4.1303
I suppose it’s the latest version ?
Do I have to install CODE following this guide ?