App with id richdocuments has invalid signature

I am using Nextcloud 12 with Collabora 2.1 and Collabora App 1.12.28, everything is working fine. Today I saw there is an update for Collabora app Update to 1.12.29 so when I try to update it says Couldn’t update app.
In the Nextcloud Admin panel in logging I see this error App with id richdocuments has invalid signature

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Same problem here. Also i am not able anymore to use collabora. It seams disabled.

same here.
Running both Nextcloud & CODE as docker containers on unRAID server.
Had successfully upgraded NC from 11 to 12 using the built-in upgrade gui, then tried updating the Collabora app unsuccessfully…

I have same problem too.
Error core App with id richdocuments has invalid signature 2017-05-25T12:06:57+0300

Solution is near; thanks @enoch85

@timar Needs to update the signature.

Now it works.

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Thanks @enoch85 its working now.

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