undefined reference to `GameLayer::GameLayer()

*Plz help me i m porting game in android but i m geting error in eclipse “undefined reference to `GameLayer::GameLayer‘”\ in\ HelloWorld\ class\ which\ is\ inherited\ from\ GameLayer*

E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/obj/local/armeabi/objs-debug/game_logic/HelloWorldScene.o:\ In\ function\ `HelloWorld’:
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/jni/…/…/Classes/HelloWorldScene.cpp:27:\ undefined\ reference\ to\ `GameLayer::GameLayer‘
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/jni/…/…/Classes/HelloWorldScene.cpp:27:\ undefined\ reference\ to\ `GameLayer::GameLayer()’
make:\ Leaving\ directory\ `/cygdrive/e/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android’
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/obj/local/armeabi/objs-debug/game_logic/HelloWorldScene.o:\ In\ function\ `HelloWorld::init‘:
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/jni/…/…/Classes/HelloWorldScene.cpp:55:\ undefined\ reference\ to\ `GameLayer::init()’
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/jni/…/…/Classes/HelloWorldScene.cpp:61:\ undefined\ reference\ to\ `WorldByEditor::WorldByEditor‘
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/jni/…/…/Classes/HelloWorldScene.cpp:62:\ undefined\ reference\ to\ `WorldByEditor::init()’
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/obj/local/armeabi/objs-debug/game_logic/HelloWorldScene.o:\ In\ function\ `HelloWorld::addNewSpriteWithCoords‘:\
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/obj/local/armeabi/objs-debug/game_logic/HelloWorldScene.o:\ In\ function\ `HelloWorld::draw()’:
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/jni/…/…/Classes/HelloWorldScene.cpp:157:\ undefined\ reference\ to\ `glDisable’
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/jni/…/…/Classes/HelloWorldScene.cpp:158:\ undefined\ reference\ to\ `glDisableClientState’
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/jni/…/…/Classes/HelloWorldScene.cpp:159:\ undefined\ reference\ to\ `glDisableClientState’
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/jni/…/…/Classes/HelloWorldScene.cpp:163:\ undefined\ reference\ to\ `glEnable’
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/jni/…/…/Classes/HelloWorldScene.cpp:164:\ undefined\ reference\ to\ `glEnableClientState’
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/jni/…/…/Classes/HelloWorldScene.cpp:165:\ undefined\ reference\ to\ `glEnableClientState’
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/jni/…/…/Classes/HelloWorldScene.cpp:169:\ undefined\ reference\ to\ `glEnable’
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/jni/…/…/Classes/HelloWorldScene.cpp:170:\ undefined\ reference\ to\ `glColor4ub’
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/jni/…/…/Classes/HelloWorldScene.cpp:171:\ undefined\ reference\ to\ `glLineWidth’
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/obj/local/armeabi/objs-debug/game_logic/HelloWorldScene.o:\ In\ function\ `~HelloWorld’:
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/jni/…/…/Classes/HelloWorldScene.cpp:481:\ undefined\ reference\ to\ `GameLayer::GameLayer()‘
E:/Acocos2d-x/cocos2d-1.0.1-x-0.11.0/MyBilliard/android/jni/…/…/Classes/HelloWorldScene.cpp:481: undefined reference to `GameLayer::GameLayer’

My\ header\ file\ HelloWorldScene.h
#pragma\ once
//\ When\ you\ import\ this\ file,\ you\ import\ all\ the\ cocos2d\ classes
#include\ “cocos2d.h”
#include\ “Layer/GameLayer/GameLayer.h”
//#include\ “MyContactListener.h”
#include\ “b2dContectList/ContectListener.h”//remove
#include\ “GLES-Render.h”
#include\ <Box2D/Box2D.h>\
#include\ “Layer/Level1/Ball.h”\
#include\ “Constants.h”
class\ ContectListener;//remove
using\ namespace\ cocos2d;

class\ HelloWorld\ :\ public\ GameLayer\ {

public:\
\ WorldByEditor\ *billiardWorld;\
\ HelloWorld;
\ virtualHelloWorld();
// returns a Scene that contains the HelloWorld as the only child
static CCScene* scene();
virtual void init();
};
in my HelloWorldScene.cpp
HelloWorld::HelloWorld()////////////////////////////////////////////////undefined reference to `GameLayer::GameLayer’
{\
\ GameLayer\ LAYER=new\ GameLayer;
\ screenSize\ =\ CCDirector::sharedDirector~~>getWinSize;
\ cocos2d::CCSprite\ background=\ CCSprite::spriteWithFile;
\ background~~>setAnchorPoint);
\ background~~>setPosition);
\ addChild;
}
CCScene
\ HelloWorld::scene
{\
\ //’scene’\ is\ an\ autorelease\ object
\ CCScene\ **scene\ =\ new\ CCScene;\

\ //\ add\ layer\ as\ a\ child\ to\ scene
\ CCLayer**\ layer\ =\ new\ HelloWorld;
\ scene~~>addChild;
\ layer~~>release;
\ return\ scene;
}

void\ HelloWorld::init
{
\ //initialize\ superlayer
\ GameLayer::init;
\ //initialize\ some\ variable
\ setIsTouchEnabled;
\ setIsAccelerometerEnabled;\
\ stricker=false;
\ //back\ ground
\ billiardWorld=new\ WorldByEditor;
\ billiardWorld~~>init;\
\ addChild;
\ ///set\ up\ stick
\ stick=\ CCSprite::spriteWithFile;
\ stick~~>setAnchorPoint);\
\ stick~~>setPosition);
\ addChild;\
\ //setup\ main\ game\
\ setupBallSprites;

\ /////////////////////
\ setupPhysicsBodies;\
\ m_bodyIndex\ =\ 0;
\ m_angle\ =\ 0.0f;

\ schedule\ );\
}
HelloWorld::HelloWorld()//////////////////////////////////////////////////////undefined reference to `GameLayer::~GameLayer()’
{
unschedule(schedule_selector(HelloWorld::tick) );
//ball~~>destroyBodyInWorld;
delete billiardWorld~~>*world;
billiardWorld->*world = NULL;
}
//////////////////////////////////////////////////////////////////////////////////////

Whenever you get “undefined reference” it’s a linkage problem. It means you need to look into your Android.mk files to make sure you’ve added all libraries you need.

Thank You Friend for fast Response But Problem in My C++ Game classes My Project Hirarchy is as
Android
Classes
Resources

Classes~~>HelloWorld.h
Classes~~>Layer~~>GameLayer~~>GameLayer.h

I have defined #include “Layer/GameLayer/GameLayer.h” in HelloWorldScene File

HelloWorld is inherited from GameLayer Class