question:setValue:forUndefinedKey: this class is not key value coding-compliant for the key

setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key  .

reason: as you created a  xib with a class   somehow   i put the uiimageview on the file's owner ,   in fact  i  am not suppose to . 

solution: just delete the uiimageview  off  file's owner and it's done