An example ERROR message of running GUI applications written in Qt toolkit in Ubuntu

ERROR: (python:52708): Gtk-CRITICAL **: IA__gtk_widget_style_get: assertion 'GTK_IS_WIDGET (widget)' failed One solution to this error is installing qt4-qtconfig, a Qt 4 configuration tool 
#install
sudo apt-get install qt4-qtconfig
# run the configuration
qtconfig
#config
#In the Appearance tab of the Qt Configuration application, locate "Select GUI Style" menu and choose "Plastique" option from drop down list.
#Save and exit
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