Problem when updating application

We have a problem when updating applications.
An error occured during the request. Unable to proceed.
Couldn’t update app.
Please help. Updating the engine does not solve the problem.

I have exactly the same problem. I am on Nextcloud 18.0.3

occ -vvv app:update --all
mail new version available: 1.1.4
mail couldn't be updated
spreed new version available: 8.0.7
spreed couldn't be updated
contacts new version available: 3.2.0
contacts couldn't be updated
calendar new version available: 2.0.2
calendar couldn't be updated

Any ideas how to solve this?

Hi,

I have the same problem too…

calendar new version available: 3.0.6
calendar couldn’t be updated
contacts new version available: 4.0.8
contacts couldn’t be updated
richdocuments new version available: 5.0.2
richdocuments couldn’t be updated

any help appreciated…thank you