1>ElementClasses.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall Element_METH::~Element_METH(void)" (??1Element_METH@@UAE@XZ) referenced in function "class std::vector<class Element,class std::allocator<class Element> > __cdecl GetElements(void)" (?GetElements@@YA?AV?$vector@VElement@@V?$allocator@VElement@@@std@@@std@@XZ)
1>METH.obj : error LNK2001: unresolved external symbol "public: virtual __thiscall Element_METH::~Element_METH(void)" (??1Element_METH@@UAE@XZ)