xlib: extension "XFree86-DRI" missing on display ":0.0".

[kiransu123]

when i trying to display image the above error is coming
my program is

#include "qgl.h"
#include "qapplication.h"
#include "qimage.h"
class PaintWidget : public QGLWidget{
	public:
		PaintWidget(const QString &filename,QWidget *parent=0);
		void paintGL();
		void resizeGL(int w,int h);
	protected:
		QImage data,gldata;
		float width,height;
};
 
PaintWidget::PaintWidget(const QString &filename,QWidget *parent):QGLWidget(parent){
	data.load(filename);
	resize(data.size());
}
 
 
void PaintWidget::paintGL(){
	QImage half=data.copy(0,0,data.width()/2,data.height()/2);	
 
	gldata = QGLWidget::convertToGLFormat(half);
	glDrawPixels(gldata.width(), gldata.height(), GL_RGBA, GL_UNSIGNED_BYTE, gldata.bits());
 
}
 
void PaintWidget::resizeGL(int w, int h){
	glViewport(0,0,w,h);
	width=w;
	height=h;	
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(0,w,0,h,-1,1);
	glMatrixMode(GL_MODELVIEW);
}
 
int main(int argc, char** argv){
	QApplication app(argc,argv);
	PaintWidget pw(argv[1]);
	pw.showFullScreen();
	return app.exec();
 
}

#include "qgl.h"
#include "qapplication.h"
#include "qimage.h"
class PaintWidget : public QGLWidget{
	public:
		PaintWidget(const QString &filename,QWidget *parent=0);
		void paintGL();
		void resizeGL(int w,int h);
	protected:
		QImage data,gldata;
		float width,height;
};

PaintWidget::PaintWidget(const QString &filename,QWidget *parent):QGLWidget(parent){
	data.load(filename);
	resize(data.size());
}


void PaintWidget::paintGL(){
	QImage half=data.copy(0,0,data.width()/2,data.height()/2);	
	
	gldata = QGLWidget::convertToGLFormat(half);
	glDrawPixels(gldata.width(), gldata.height(), GL_RGBA, GL_UNSIGNED_BYTE, gldata.bits());
	
}

void PaintWidget::resizeGL(int w, int h){
	glViewport(0,0,w,h);
	width=w;
	height=h;	
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(0,w,0,h,-1,1);
	glMatrixMode(GL_MODELVIEW);
}

int main(int argc, char** argv){
	QApplication app(argc,argv);
	PaintWidget pw(argv[1]);
	pw.showFullScreen();
	return app.exec();

}

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