SYNCHRONIZATION INFO
Synchronization phase: 9
Account name: Engineer
Authority: org.dmfs.tasks

STACK TRACE:
java.lang.ClassCastException: net.fortuna.ical4j.model.Date cannot be cast to net.fortuna.ical4j.model.DateTime
at net.fortuna.ical4j.model.property.UtcProperty.getDateTime(UtcProperty.java:73)
at at.bitfire.ical4android.AndroidTask.buildTask(AndroidTask.java:290)
at at.bitfire.davdroid.resource.LocalTask.buildTask(LocalTask.java:75)
at at.bitfire.ical4android.AndroidTask.add(AndroidTask.java:226)
at at.bitfire.davdroid.syncadapter.TasksSyncManager.processVTodo(TasksSyncManager.java:213)
at at.bitfire.davdroid.syncadapter.TasksSyncManager.downloadRemote(TasksSyncManager.java:179)
at at.bitfire.davdroid.syncadapter.SyncManager.performSync(SyncManager.java:182)
at at.bitfire.davdroid.syncadapter.TasksSyncAdapterService$SyncAdapter.onPerformSync(TasksSyncAdapterService.java:63)
at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:259)

SOFTWARE INFORMATION
DAVdroid version: 0.9.1.3 (87) Sun Jan 03 07:04:57 GMT+00:00 2016
Installed from: APK (directly)
JB Workaround installed: no

CONFIGURATION
System-wide synchronization: automatically
Account: Engineer
  Address book sync. interval: —
  Calendar     sync. interval: 1440 min
  OpenTasks    sync. interval: 1440 min

SYSTEM INFORMATION
Android version: 5.0.1 (LRX22C.I9505XXUHOD7)
Device: Samsung GT-I9505 (jflte)