There are more reasons regarding this issue likeThere are many root causes for this issue like
- theThe farm account is not added to the local administrator group during starting and provisioning UPS service.
- theThe User Profile Sync Service account is not a member of the Farm Administrator group.
- Forefront Identity Manager Service isServices are not running.
and SO on...
At the following articles, I found out details reasons listPlease, check other root causes and how to solve it, Hope it helps you.overcome this issue at