Проблема с сигнал-слот. Помогите срочно!!!

#ifndef GLGRAHF_H
#define GLGRAHF_H

#include <QGLWidget>
#include <QGLPixelBuffer>
#include <QMouseEvent>
#include <QKeyEvent>
#include <QGLFormat>
#include <QTimer>
#include <QImage>

#include "dataModel.h"

class GlGrahf : public QGLWidget
{
Q_OBJECT

private:
   GLfloat m_xRotate;
   GLfloat m_yRotate;

   QTimer *m_timer;

   GLuint      texture[3];

   void loadGLTextures();

protected:
   virtual void initializeGL();
   virtual void resizeGL(int nWidth, int nHeight);
   virtual void paintGL();

   virtual void keyPressEvent(QKeyEvent * pe);

public slots:
   void timeOutSlot();

public:
   GlGrahf(QWidget * pwgt = 0);
   ~GlGrahf();
};

#endif // GLGRAHF_H

#include "GlGrahf.h"

GlGrahf::GlGrahf(QWidget *pwgt /*= 0*/) : QGLWidget(pwgt)

{
   m_timer = new QTimer(this);

   connect(m_timer, SIGNAL(timeout()), this, SLOT(timeOutSlot()));
   m_timer->start(0);

   m_xRotate = m_yRotate = 0;
}

GlGrahf::~GlGrahf()
{
}

void GlGrahf::initializeGL()
{

   //loadGLTextures();

   glEnable(GL_TEXTURE_2D);                  // Enable Texture Mapping
   glShadeModel(GL_SMOOTH);                  // Enable Smooth Shading
   glClearColor(1.0f, 1.0f, 1.0f, 0.5f);               // Black Background
   glClearDepth(1.0f);                        // Depth Buffer Setup
   glEnable(GL_DEPTH_TEST);                  // Enables Depth Testing
   glDepthFunc(GL_LEQUAL);                     // The Type Of Depth Testing To Do
   glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);         // Really Nice Perspective Calculations

}

void GlGrahf::resizeGL(int nWidth, int nHeight)
{
   if (nHeight==0)                        // Prevent A Divide By Zero By
   {
   nHeight=1;                     // Making Height Equal One
   }
   glViewport(0, 0, (GLint)nWidth, (GLint)nHeight);

   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();

   gluPerspective(45.0f,(GLfloat)nWidth/(GLfloat)nHeight,0.1f,100.0f);

   glMatrixMode(GL_MODELVIEW);                  // Select The Modelview Matrix
   glLoadIdentity();                     // Reset The Modelview Matrix

}

void GlGrahf::loadGLTextures()
{
  QImage t;
  QImage b;

  if ( !b.load( "../Data/Crate.bmp" ) )
  {
   b = QImage( 16, 16, QImage::Format_ARGB32);
   b.fill(Qt::green);
  }

  t = QGLWidget::convertToGLFormat( b );
  glGenTextures( 3, &texture[0]);

  glBindTexture( GL_TEXTURE_2D, texture[0] );
  glTexImage2D( GL_TEXTURE_2D, 0, 3, t.width(), t.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, t.bits() );
   glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST); // ( NEW )
   glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST); // ( NEW )

  glBindTexture( GL_TEXTURE_2D, texture[1] );
  glTexImage2D( GL_TEXTURE_2D, 0, 3, t.width(), t.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, t.bits() );
   glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
   glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);

  glBindTexture( GL_TEXTURE_2D, texture[2] );

   glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
   glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST); // ( NEW )
   gluBuild2DMipmaps(GL_TEXTURE_2D, 3, t.width(), t.height(), GL_RGBA, GL_UNSIGNED_BYTE, t.bits()); // ( NEW )

}

void GlGrahf::paintGL()
{

   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
   glLoadIdentity();

   glRotatef(m_xRotate, 1, 0, 0);
   glRotatef(m_yRotate,0 , 1, 0);

   glTranslatef(0.0f,0.0f,-5.0f);
   glColor3f(0,0,0);
   glBegin(GL_QUADS);
   glVertex3f(0,1,0);
   glVertex3f(1,1,0);
   glVertex3f(1,1,1);
   glVertex3f(0,1,1);
   glEnd();

}

void GlGrahf::keyPressEvent(QKeyEvent *pe)
{
//   switch(pe->key()){
//      case Qt::Key_F1:
//            x_scale = 1.5;
//            updateGL();
//            break;
//   }

}

void GlGrahf::timeOutSlot()
{
   m_xRotate +=0.3f;                        // X Axis Rotation
   //m_yRotate +=0.2f;                        // Y Axis Rotation

updateGL();
}

ставится как центральный виджет QmainWindow и ошибка (сам виджет работает)