QOpenGLShaderProgram and QOpenGLShader Issues

[VirtuousLeo]

Hello Guys,
I am a newbie in Qt 5.1 and i have installed Qt in debian (wheezy). This is the package that i have installed qt-linux-opensource-5.1.1-x86_64-offline available at http://qt-project.org/downloads

I am trying to run the already provided examples available with QtCreator. If i run a non qml application (e.g. "Application Example" in the QtCreator examples section ) the demo runs successfully, but when i try to run a qml based example (e.g. "Qt Quick Controls- Table View Example" in the QtCreator examples section) i only get a blank screen without anything being rendered on it except the title bar and this happens with all the other qml based examples.


The error log when running the "Qt Quick Controls-Table view example" is as follows

Starting /home/test/Qt5.1.1/5.1.1/gcc_64/examples/quick/controls/build-tableview-Desktop_Qt_5_1_1_GCC_64bit-Debug/tableview...
QML debugging is enabled. Only use this in a safe environment.
QXcbConnection: Failed to get the primary output of the screen
QXcbConnection: XCB error: 168 (Unknown), sequence: 150, resource id: 80, major code: 149 (Unknown), minor code: 20
QSGContext::initialize: stencil buffer support missing, expect rendering errors
QOpenGLShaderProgram: could not create shader program
QOpenGLShader: could not create shader
QSGMaterialShader: Shader compilation failed:
""
QOpenGLShaderProgram::uniformLocation( matrix ): shader program is not linked
QOpenGLShaderProgram::uniformLocation( opacity ): shader program is not linked
QOpenGLShaderProgram: could not create shader program
QOpenGLShader: could not create shader
QSGMaterialShader: Shader compilation failed:
""
QOpenGLShaderProgram::uniformLocation( matrix ): shader program is not linked
QOpenGLShaderProgram::uniformLocation( color ): shader program is not linked
QOpenGLShaderProgram: could not create shader program
QOpenGLShader: could not create shader
QSGMaterialShader: Shader compilation failed:
""
QOpenGLShaderProgram::uniformLocation( qt_Matrix ): shader program is not linked
QOpenGLShaderProgram: could not create shader program
QOpenGLShader: could not create shader
QSGMaterialShader: Shader compilation failed:
""
QOpenGLShaderProgram::uniformLocation( qt_Matrix ): shader program is not linked
QOpenGLShaderProgram::uniformLocation( opacity ): shader program is not linked
QOpenGLShaderProgram: could not create shader program
QOpenGLShader: could not create shader
QSGMaterialShader: Shader compilation failed:
""
QOpenGLShaderProgram::uniformLocation( pixelSize ): shader program is not linked
QOpenGLShaderProgram::uniformLocation( qt_Matrix ): shader program is not linked
QOpenGLShaderProgram::uniformLocation( opacity ): shader program is not linked
QOpenGLShaderProgram: could not create shader program
QOpenGLShader: could not create shader
QSGMaterialShader: Shader compilation failed:
""
QOpenGLShaderProgram::uniformLocation( matrix ): shader program is not linked
QOpenGLShaderProgram::uniformLocation( opacity ): shader program is not linked
QOpenGLShaderProgram::uniformLocation( pixelSize ): shader program is not linked
QOpenGLShaderProgram: could not create shader program
QOpenGLShader: could not create shader
QSGMaterialShader: Shader compilation failed:
""
QOpenGLShaderProgram::uniformLocation( matrix ): shader program is not linked
QOpenGLShaderProgram::uniformLocation( textureScale ): shader program is not linked
QOpenGLShaderProgram::uniformLocation( color ): shader program is not linked
QOpenGLShaderProgram::uniformLocation( alphaMin ): shader program is not linked
QOpenGLShaderProgram::uniformLocation( alphaMax ): shader program is not linked
QOpenGLShaderProgram: could not create shader program
QOpenGLShader: could not create shader
QSGMaterialShader: Shader compilation failed:
""
QOpenGLShaderProgram::uniformLocation( matrix ): shader program is not linked
QOpenGLShaderProgram::uniformLocation( color ): shader program is not linked
QOpenGLShaderProgram::uniformLocation( textureScale ): shader program is not linked
QOpenGLShader: could not create shader
QOpenGLShaderProgram: could not create shader program
QOpenGLShader: could not create shader
QOpenGLShaderProgram::uniformLocation( imageTexture ): shader program is not linked

Please let me know what i am doing wrong here and is there something that is missing on my debian environment.