title: Unable to reference one class library from another
body: <p>I have an assignment about OOP in C# that involves me creating a base class (in the form of a class library) and a derived class (as another class library). I realize that for the two to function properly I need to reference the base class' .dll in the derived class. However, I am unable to generate that .dll file for the base class, as I get the error "A project with an Output type of Class Library cannot be started directly". My textbook says the fix for this is to click "Build Solution" in VS 2013, which should make it runnable. I've done so, and yet mien still does not function. Where am I going wrong?</p>