Hi

I want to add physx to my engine but I'm getting a very strange errors:

1>------ Build started: Project: Game, Configuration: Debug Win32 ------
1>PhysX3CommonCHECKED_x86.lib(PhysX3CommonCHECKED_x86.dll) : error LNK2005: "public: class physx::PxFlags<enum physx::PxSerialFlag::Enum,unsigned short> __thiscall physx::PxFlags<enum physx::PxSerialFlag::Enum,unsigned short>::operator~(void)const " (??S?$PxFlags@W4Enum@PxSerialFlag@physx@@G@physx@@QBE?AV01@XZ) already defined in FreeCamera.obj
1>PhysX3CommonCHECKED_x86.lib(PhysX3CommonCHECKED_x86.dll) : error LNK2005: "public: __thiscall physx::PxFlags<enum physx::PxSerialFlag::Enum,unsigned short>::PxFlags<enum physx::PxSerialFlag::Enum,unsigned short>(enum physx::PxSerialFlag::Enum)" (??0?$PxFlags@W4Enum@PxSerialFlag@physx@@G@physx@@QAE@W4Enum@PxSerialFlag@1@@Z) already defined in FreeCamera.obj
1>PhysX3CommonCHECKED_x86.lib(PhysX3CommonCHECKED_x86.dll) : error LNK2005: "public: class physx::PxFlags<enum physx::PxSerialFlag::Enum,unsigned short> & __thiscall physx::PxFlags<enum physx::PxSerialFlag::Enum,unsigned short>::operator&=(class physx::PxFlags<enum physx::PxSerialFlag::Enum,unsigned short> const &)" (??_4?$PxFlags@W4Enum@PxSerialFlag@physx@@G@physx@@QAEAAV01@ABV01@@Z) already defined in FreeCamera.obj
1>PhysX3CommonCHECKED_x86.lib(PhysX3CommonCHECKED_x86.dll) : error LNK2005: "public: __thiscall physx::PxFlags<enum physx::PxSerialFlag::Enum,unsigned short>::PxFlags<enum physx::PxSerialFlag::Enum,unsigned short>(void)" (??0?$PxFlags@W4Enum@PxSerialFlag@physx@@G@physx@@QAE@XZ) already defined in FreeCamera.obj
1>PhysX3CommonCHECKED_x86.lib(PhysX3CommonCHECKED_x86.dll) : error LNK2005: "public: __thiscall physx::PxFlags<enum physx::PxSerialFlag::Enum,unsigned short>::PxFlags<enum physx::PxSerialFlag::Enum,unsigned short>(class physx::PxFlags<enum physx::PxSerialFlag::Enum,unsigned short> const &)" (??0?$PxFlags@W4Enum@PxSerialFlag@physx@@G@physx@@QAE@ABV01@@Z) already defined in FreeCamera.obj
1>PhysX3CommonCHECKED_x86.lib(PhysX3CommonCHECKED_x86.dll) : error LNK2005: "public: __thiscall physx::PxFlags<enum physx::PxSerialFlag::Enum,unsigned short>::operator bool(void)const " (??B?$PxFlags@W4Enum@PxSerialFlag@physx@@G@physx@@QBE_NXZ) already defined in FreeCamera.obj
1>PhysX3CommonCHECKED_x86.lib(PhysX3CommonCHECKED_x86.dll) : error LNK2005: "public: class physx::PxFlags<enum physx::PxSerialFlag::Enum,unsigned short> __thiscall physx::PxFlags<enum physx::PxSerialFlag::Enum,unsigned short>::operator&(enum physx::PxSerialFlag::Enum)const " (??I?$PxFlags@W4Enum@PxSerialFlag@physx@@G@physx@@QBE?AV01@W4Enum@PxSerialFlag@1@@Z) already defined in FreeCamera.obj
1>E:\Tools\game_engine\MyEngine\Engine\Debug\Game.exe : fatal error LNK1169: one or more multiply defined symbols found

I found a single line in my code that cause these errors but the code is true here my code for starting physx:

CPhysxPhysic::CPhysxPhysic(void)
{
	m_Physics=NULL;
	m_Foundation=NULL;

   //static PxDefaultErrorCallback gDefaultErrorCallback;
   //static PxDefaultAllocator gDefaultAllocatorCallback;

   printf("initializing PhysX\n");
 
   printf("creating Foundation\n");
 // create foundation object with default error and allocator callbacks.
   m_Foundation = PxCreateFoundation(PX_PHYSICS_VERSION,gDefaultAllocatorCallback,gDefaultErrorCallback);
 
   printf("creating Physics\n");
   // create Physics object with the created foundation and with a 'default' scale tolerance.
   m_Physics = PxCreatePhysics(PX_PHYSICS_VERSION,*m_Foundation,PxTolerancesScale());

   m_Cooking = PxCreateCooking(PX_PHYSICS_VERSION, *m_Foundation, PxCookingParams());
   if (!m_Cooking)
    printf("PxCreateCooking failed!\n");

   if (!PxInitExtensions(*m_Physics))//This line is the problem!!!
    printf("PxInitExtensions failed!\n");

   m_ProfileZoneManager = &PxProfileZoneManager::createProfileZoneManager(m_Foundation);
	if(!m_ProfileZoneManager)
		printf("PxProfileZoneManager::createProfileZoneManager failed!\n");

	#ifdef PX_WINDOWS
		pxtask::CudaContextManagerDesc cudaContextManagerDesc;
		m_CudaContextManager = pxtask::createCudaContextManager(*m_Foundation, cudaContextManagerDesc, m_ProfileZoneManager);
		if( m_CudaContextManager )
		{
			if( !m_CudaContextManager->contextIsValid() )
			{
				m_CudaContextManager->release();
				m_CudaContextManager = NULL;
			}
		}
#endif



   PxInitVehicleSDK(*m_Physics);
   PxVehicleSetBasisVectors(PxVec3(0,1,0),PxVec3(0,0,1));

  // static PxDefaultSimulationFilterShader gDefaultFilterShader;

   PxSceneDesc sceneDesc(m_Physics->getTolerancesScale());
   sceneDesc.gravity = PxVec3(0.0f, -9.81f, 0.0f);
   // customizeSceneDesc(sceneDesc);

    if(!sceneDesc.cpuDispatcher)
    {
      m_CpuDispatcher = PxDefaultCpuDispatcherCreate(2);
       if(!m_CpuDispatcher)
          printf("PxDefaultCpuDispatcherCreate failed!\n");
       sceneDesc.cpuDispatcher    = m_CpuDispatcher;
    }
    if(!sceneDesc.filterShader)
        sceneDesc.filterShader    = PxDefaultSimulationFilterShader;

    #ifdef PX_WINDOWS
    if(!sceneDesc.gpuDispatcher && m_CudaContextManager)
    {
        sceneDesc.gpuDispatcher = m_CudaContextManager->getGpuDispatcher();
    }
    #endif

    m_Scene = m_Physics->createScene(sceneDesc);
    if (!m_Scene)
        printf("createScene failed!\n");


 
   printf("PhysX initialized\n");
}

If I remove this line I an compile the code:

 if (!PxInitExtensions(*m_Physics))//This line is the problem!!!
    printf("PxInitExtensions failed!\n");

Why I got multiply defined symbols?and how should I solve it?

EDIT:I solve it my self(after 3 days of testing I finally found the answer 5 minutes after asking here :D).I included <PxPhysicsAPI.h> before any other header file and it solved my problem.