using namespace irr;
using namespace core;
using namespace scene;
using namespace video;
using namespace io;
using namespace gui;
class CPaddle : public CAnimatedMeshSceneNode
Yes, but it's only for Irrlich internal use. Use IAnimatedMeshSceneNode instead (but remeber that all it's members are pure virtual). Or add CAnimatedMeshSceneNode.h and CAnimatedMeshSceneNode.cpp(i'm not sure if this one needed) to your project (you may also have to add some pervious dependencies).