Bug QGLWidget::renderText with Opengl 3.3 core profile

Hello
My function glWidget::renderText didn't work. This message appears on my console : "QColor :: setRgbF : RGB parameters out of range".

Further :

• if I use void QGLWidget::renderText ( int x, int y, const QString & str, const QFont & font = QFont(), int listBase = 2000 ) nothing is written.

-if I use void QGLWidget::renderText ( double x, double y, double z, const QString & str, const QFont & font = QFont(), int listBase = 2000 ) nothing is written and my opengl rendering loses quality.

I used an opengl 3.3 context core profile.

Thanks to give me help.....