qt5 - Signal/Slots with VIsual studio and Qt plugin -

i have issue slots , signals in visual studio 2012 qt plugin. when compile qt project, shows error:

moc_mainwindow.obj : error lnk2019: unresolved external symbol "public: void __thiscall mainwindow::onupdate(class qstring)" (?onupdate@mainwindow@@qaexvqstring@@@z) referenced in function "private: static void __cdecl mainwindow::qt_static_metacall(class qobject *,enum qmetaobject::call,int,void * *)" (?qt_static_metacall@mainwindow@@caxpavqobject@@w4call@qmetaobject@@hpapax@z)

these classes:

mainwindow.h

#ifndef mainwindow_h #define mainwindow_h  #include <qmainwindow> #include <qtextedit> #include <qstring>  namespace ui {     class mainwindow; }  class mainwindow : public qmainwindow {     q_object  public:     explicit mainwindow(qwidget *parent = 0);     ~mainwindow();  public slots:     void onupdate(qstring info);  private:     ui::mainwindow *ui;     qtextedit *textedit; };  #endif // mainwindow_h 

mainwindow.cpp

#include "mainwindow.h" #include "ui_mainwindow.h" #include <qstring>  mainwindow::mainwindow(qwidget *parent) :     qmainwindow(parent),     ui(new ui::mainwindow) {     ui->setupui(this); }  mainwindow::~mainwindow() {     delete ui; }  mainwindow::onupdate(qstring info) {     //ui->textedit->append(info); } 

some help? in advance!

solved!

i've included generated files folder in project solution. anyway!