Gtk-WARNING

When I was running a GUI application in IDEA8, I was continuously getting the error message:
(:10099): Gtk-WARNING **: Attempting to add a widget with type GtkButton to a GtkComboBoxEntry (need an instance of GtkEntry or of a subclass)

(:10099): Gtk-CRITICAL **: gtk_widget_realize: assertion `GTK_WIDGET_ANCHORED (widget) || GTK_IS_INVISIBLE (widget)' failed

(:10099): Gtk-CRITICAL **: gtk_paint_box: assertion `style->depth == gdk_drawable_get_depth (window)' failed

(:10099): Gtk-CRITICAL **: gtk_paint_box: assertion `style->depth == gdk_drawable_get_depth (window)' failed

(:10099): Gtk-CRITICAL **: gtk_paint_box: assertion `style->depth == gdk_drawable_get_depth (window)' failed

(:10099): Gtk-CRITICAL **: gtk_paint_box: assertion `style->depth == gdk_drawable_get_depth (window)' failed

in the IDEA output window.

I later found that this issue is listed here in IntelliJIDEA bug database.

Finally I was able to fix the issue by simply switching back the operating system theme to the default one [Earlier I had Mac4Lin], though smarter solutions may exist.