How can i use Isgl3dDemoCameraController in PODTestView?

[Bảo Lâm]

I'm a new programer. I'm using PODTestView to load my "lotus_old.pod" object. Then i want to using Isgl3dDemoCameraController to interactive into object like touch & rotate object. I've import Isgl3dDemoCameraController.h and @class Isgl3dDemoCameraController. But i get error:

Undefined symbols for architecture armv7:

  "_OBJC_CLASS_$_Isgl3dDemoCameraController", referenced from:

      objc-class-ref in PODTestView.o

ld: symbol(s) not found for architecture armv7

clang: error: linker command failed with exit code 1 (use -v to see invocation)

 Here is content of PODTestView.h file: 

#import "isgl3d.h"

#import "Isgl3dDemoCameraController.h"

@class Isgl3dDemoCameraController;

@interface PODTestView : Isgl3dBasic3DView {

float _angle;

    Isgl3dShadowCastingLight * _redLight;

    Isgl3dDemoCameraController * _cameraController;

}

@end

/*

 * Principal class to be instantiated in main.h. 

 */

#import "Isgl3dAppDelegate.h"

@interface AppDelegate : Isgl3dAppDelegate

- (void) createViews;

@end

Hope you guys help me what i was wrong in this. Thanks!