qt - C++ - Undefined reference to `vtable -

i wondering why getting error: undefined reference `vtable baserenderer'

i tried searching around cannot seem figure out. i've tried getting rid of virtual function, removing constructor, etc.

my baserenderer.h

class baserenderer : public renderer {  q_object      public:         baserenderer();         baserenderer(qwidget *parent);         void paintgl();          virtual ~baserenderer();   public slots:   void loaddialog();   signals:      protected:         mesh loadmesh(string filename);      private:          objparser objparser;         mesh baseterrain;  }; 

my baserenderer.cpp

baserenderer::baserenderer()              <------ error leads me here { }  baserenderer::baserenderer(qwidget *parent) : renderer(parent) {  }  baserenderer::~baserenderer() {     //dtor } 

how go getting rid of issue? hear may compiler...? :)

since q_object in parent class, renderer, don't have include baserenderer. rid of q_object , should work :)