You cant call a function from a non-existent class. Either remove the class or create it, those are you're 2 choices.
Read your errors, don't expect us to spoonfeed you, most errors show at what line the error occur. EG filename.cpp(86) that means there is an error on line 86 of filename.cpp, Read the error than check out you're line. I recommend you spend more time learning C++.