Data synchronization from Active Directory failed. The following exception was thrown during the synchronization process: ...

Data synchronization from Active Directory failed.

The following exception was thrown during the synchronization process:
Exception: %1
Inner Exception: %2
The next synchronization attempt will be in %3 minutes.
Cause: Unhandled exception.
Resolution:
Verify the connectivity with the domain controller or if the Active Directory schema was properly applied and all user attributes are present.