There is a problem in F-Droid 0.101-alpha1 with permission for SDK > 23. It even prevented updating F-Droid itself to a version that has the fix. So the fix here is to uninstall F-Droid and reinstall it again from website apk download. Then you can install/update DAVDroid to the newest version.
Owncloud -> Android 5.0 -> Open Tasks => results in 500 Internal Server Error
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This happens always and only a Samsung Galaxy S5, when I turned off task (aufgaben) syncing, the rest calendar+carddav runs fine. At the same Time two Samsung Devices with Android 4.x had no problems on syncing tasks.
Bugreport: http://ur1.ca/oqtmw
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- Your error report is not related to tasks, but the calendars (
Authority: com.android.calendar, request is for VEVENT). - This is an internal server error, possibly for the same reason as https://forums.bitfire.at/topic/1024/owncloud-this-recurrence-rule-does-not-generate-any-valid-instances/ and https://forums.bitfire.at/topic/1031/caldav-sync-no-longer-works-backtrace-with-owncloud-7-0-4-after-update-to-davdroid-1-x/. Please see there for a workaround.
- Your error report is not related to tasks, but the calendars (