viewcontroller - Receiving this error. No visible @interface for 'UIViewController' declares the selector 'presentViewController' -


the problem @ if ([[topviewcontroller presentviewcontroller] line:

(void)sessionstatechanged:(fbsession *)session       state:(fbsessionstate) state                       error:(nserror *)error {     switch (state) {         case fbsessionstateopen: {             uiviewcontroller *topviewcontroller =             self.navcontroller topviewcontroller];              if ([[topviewcontroller presentviewcontroller]                  iskindofclass:[pbloginviewcontroller class]]) {                 [topviewcontroller dismissviewcontrolleranimated:yes completion:nil];


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