I am using cocos2d-x 2.2.2 in xcode 5 .

My problem is when i add new c++ class same as HelloWorldScene.cpp .

But when i run it is giving this error

Apple Mech-o Linker Error
"MainScene::MainScene()", referenced from:

This is my MainScene.h File Code

ifndef SpaceShooterMainScene__¶

define SpaceShooterMainScene__¶

include "cocos2d.h"¶

class MainScene : public cocos2d::CCLayer{
public:
MainScene();
bool init();
static cocos2d::CCScene* scene();

CREATE_FUNC(MainScene);

};

endif /* defined(__SpaceShooter__MainScene__) */¶

And this is my MainScene.cpp file Code

include "MainScene.h"¶

USING_NS_CC;

CCScene* MainScene::scene()
{
// 'scene' is an autorelease object
CCScene *scene = CCScene::create();

// 'layer' is an autorelease object
MainScene *layer = MainScene::create();

// add layer as a child to scene
scene->addChild(layer);

// return the scene
return scene;

}

bool MainScene::init(){

return true;

}

Please Help me to get out of here.....