Error 1 error LNK2019: unresolved external symbol "void __cdecl soundData::laodFromFile(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class soundData::Frames &,class std::basic_ostream<char,struct std::char_traits<char> > &)" (?laodFromFile@soundData@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@AAVFrames@1@AAV?$basic_ostream@DU?$char_traits@D@std@@@3@@Z) referenced in function "void __cdecl cppMain(int,char const * const * const)" (?cppMain@@YAXHQBQBD@Z) C:\lacture\loading frames\loading frames\main.obj loading frames