its not an error it only warning
Example:-
in .h file
-(void)updateFromTable:(NSManagedObject*)mObject:(NSString *)key:(NSString *)value;
'mObject'Used As Name of the previous parameter rather than as part of selector
.m file
-(void)updateFromTable:(NSManagedObject*)mObject:(NSString *)key:(NSString *)value{
[mObject setValue:value forKey:key];
[self save];
}