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What is this

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'All objects in a relation must have object ids.'

This is what i got. My backend is Parse for ios.

NSMutableArray *facultyList=[[NSMutableArray alloc] init]; PFUser *faculty=[PFUser user]; [facultyList addObject:faculty];

        NSLog(@"Teacher Added");

        // By specifying no write privileges for the ACL, we can ensure the role cannot be altered.
        PFACL *roleACL = [PFACL ACL];
        [roleACL setPublicReadAccess:YES];
        PFRole *role = [PFRole roleWithName:@"Administrator" acl:roleACL];
        for (PFUser *user in facultyList) {
            [role.users addObject:user];
        [role saveEventually];