'Unable to parse the format string "claimID != '' & userID = %@"'

I am trying to write a NSPredicate to fetch userID and claimID and I am getting the below error.

Terminating app due to uncaught exception NSInvalidArgumentException', reason: 'Unable to parse the format string "claimID != '' & userID = %@"'

My Code is-

+(NSArray*)fetchNotificationsWithPredicate {
    NSPredicate *predicate=[NSPredicate predicateWithFormat:@"claimID != '' & userID = %@",[[NSUserDefaults standardUserDefaults] objectForKey:@"usernmae"]];
    NSLog(@"%@",[self fetchNotifications]);
    NSArray *loginUsers = [DBUtils createAndExecuteFetchRequestWithPredicate:@"Notification" predicate:predicate];
    return loginUsers;
}