hi, i have two different classes. One is Socket.m and h of type NSObject inside this class i have a method(creatSocket) which creates a socket. I want to call this method(creatSocket) inside SomeViewController.m class. How do i do that? i tryd with selector , but that did not workt for me. I get: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[Socket createSocket]: unrecognized selector sent to class 0xa250'