Unresolved external symbol in object files

During coding in Visual Studio I got an unresolved external symbol error and I’ve got no idea what to do. I don’t know what’s wrong. Could you please decipher me? Where should I be looking for what kind of errors? 1>Form.obj : error LNK2019: unresolved external symbol “public: class Field * __thiscall Field::addField(class Field *)” … Read more