<Property name contains invalid characters: 431F62EA-B7C3-C010-FF40-7D88C77A9300>

hi all i am facing some issue anyone can you please help me out. when i m trying to updating data . they give me error like like this @"FAULT = Property name contains invalid characters:
Team Lead - IOS Developer " how can i resolve them. please do urgent help required …

What do you have in the properties of the user right before you call the update method?