Issue
You're trying to sync and you see the following error in the Active Directory Synchronization Log
You may notice a user is not being synchronized.
Resolution
There's a misconfigured target in your settings. Ensure you've followed the instructions for adding targets in the 'AD Synchronization Configuration' article. Finding and removing the misconfigured target will clear up the error.
Frequently, this is caused by choosing Groups as an Object Type and using the Group Filter