“lexicon.obj : error LNK2019: unresolved external symbol “void __cdecl Error(class std::basic_string,class std::allocator >)” (?Error@@YAXV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) referenced in function “private: void __thiscall Vector::checkRange(int,char const *)” (?checkRange@?$Vector@UcharT@Lexicon@@@@AAEXHPBD@Z)” 😭