@Shun-Feng Interesting, I have never heard of this module. Thanks for the update!
Since DAVdroid 1.2.2 the setup of task synchronization fails with OpenTasks installed on Android 5.1.
Steps to reproduce:
- Clear device (in my case Fairphone 2 with Open OS 16.06)
- Install OpenTasks
- Install DAVdroid 1.2.2
- Setup account (in my case posteo.de)
- Task list does not appear in OpenTasks
- DAVdroid shows ‘tasks sync. interval’ to be ‘not available’
- Task list should appear in OpenTasks
- Use DAVdroid 1.2
Thanks for the report. This has been fixed with eb70f8690f1b04a1104d3729843ddcf881fa8ee0 and should be working again in DAVdroid 1.2.3.