ios - [ViewController presentPopupViewController:animationType:]: unrecognized selector -

been hitting head on ... trying use mjviewpopupviewcontroller , keep getting following error:

****-[viewcontroller presentpopupviewcontroller:animationtype:]: unrecognized selector sent instance 0x8016a30 2013-07-17 23:35:20.091 desitest[1055:c07] ****** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[viewcontroller presentpopupviewcontroller:animationtype:]: unrecognized selector sent instance 0x8016a30'******* 

to keep simple tried setup small test app 1 button when clicked show detailviewcontroller contains uiview label (very simple)

here code:

viewcontroller.m

#import "viewcontroller.h" #import "uiviewcontroller+mjpopupviewcontroller.h" #import "detailviewcontroller.h"   @interface viewcontroller ()  @end  @implementation viewcontroller  - (void)viewdidload {     [super viewdidload];     // additional setup after loading view, typically nib. }  - (void)didreceivememorywarning {     [super didreceivememorywarning];     // dispose of resources can recreated. }  - (ibaction)openview: (id) sender {     detailviewcontroller *dview = [[detailviewcontroller alloc]initwithnibname:@"detailviewcontroller" bundle:nil];     [self presentpopupviewcontroller:dview animationtype:mjpopupviewanimationfade];  }  @end 

detailviewcontroller.m

#import "detailviewcontroller.h"  @implementation detailviewcontroller  @end 

i appreciate help. btw: on xcode 4.6.3. in advance.

make sure "compile sources" setting contains uiviewcontroller+mjpopupviewcontroller.m file.