Sometimes, calendar synchronization shows this error:
java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.TimeZone java.util.Calendar.getTimeZone()' on a null object reference at java.text.DateFormat.getTimeZone(DateFormat.java:704) at net.fortuna.ical4j.model.DateTime.<init>(DateTime.java:236) at net.fortuna.ical4j.model.DateTime.<init>(DateTime.java:244) at net.fortuna.ical4j.model.property.UtcProperty.<init>(UtcProperty.java:67) […]
This problem seems to be limited to Android 8.0 (probably only systems which just have updated to Android 8.0).
We were not able to reproduce this problem and we don't know the reason for this problem, but it's probably related to some error in Android 8.0 which only occurs when some cache is used. If you have an idea or more information about this problem, please let us know in the linked forum thread.
- If there are further Android updates available for your device, update your device to the latest version and try again.
- Otherwise, uninstall DAVx⁵.
- Then install DAVx⁵ and set it up again. The problem should now be gone.