My nextcloud is not accessible after update

[oneitonitram (Martin)]

NethServer Version: latest
Module: latest

After updating my nethserver instance, I am now unable to login to my nextcloud

I get the error

_ Error

• The files of the app External user support (user_external) were not replaced correctly. Make sure it is a version compatible with the server.
  _

how can I sort this out

[dnutan (Marc)]

Problem with Nextcloud after Nethserver update 7.5 -> 7.6

Hello Marc, Thanks for the tips on the Nextcloud problem. After executing your commands and digging a little bit deeper, it seems that I struck a known Nextcloud bug: With the directions in this post (changing the max-version=“14” into “15” in “apps/user_external/appinfo/info.xml”) I was able to get thinks working again. Thanks Marc for putting me on the right track!