Error 21106

Message

Possible error messages:

Without Resource Bundle (default)	User context must be string for async operation replay User context must be string for async operation replay
With Resource Bundle	user context must be string for async operation replay

Domain	Persistence.PersistenceException
Number	21106
Label	USER_CONTEXT_MUST_BE_STRING
Applicable Platform(s)	iOS, Android, BlackBerry, Windows Mobile

userContext parameter of DBClass.beginSynchronize is not a string.

Use string as userContext parameter of DBClass.beginSynchronize.