OwnCloud returns error 500 and there are errors in the OwnCloud logs. I really doubt this is a DAVdroid problem.
DAVdroid Update on F-Droid
There hasn’t been any update for a long time on F-Droid-Store.
While DAVdroid is already in Version 1.9.5, the F-Droid-Store is still on 1.9.
Is there any chance to get the update on F-Droid?
We’re not involved with the F-Droid builds. But I think they managed to upgrade the build tools today so that they can compile DAVdroid again (they compile it themselves from source). It should be updated pretty soon hopefully!