i have the following error msg when i buid one of my cpp projects in visual studio 6.
pls help me, it's very urgent.

extures.obj : error LNK2001: unresolved external symbol "public: __thiscall Scene::Scene(vo id)" (??0Scene@@QAE@ XZ)
textures.obj : error LNK2001: unresolved external symbol "public: __thiscall Robot::Robot(vo id)" (??0Robot@@QAE@ XZ)
textures.obj : error LNK2001: unresolved external...