error LNK2019: unresolved external symbol

CommonLibSSE.lib(ExtraLevCreaModifier.cpp.obj) : error LNK2019: unresolved external symbol "public: virtual __cdecl RE::ExtraLevCreaModifier::~ExtraLevCreaModifier(void)" (??1ExtraLevCreaModifier@RE@@UEAA@XZ) referenced in function "public: virtual void * __cdecl RE::ExtraLevCreaModifier::`scalar deleting destructor'(unsigned int)" (??_GExtraLevCreaModifier@RE@@UEAAPEAXI@Z)