gdk_gc_predraw error

Hi,everyone.I'm a novice with using Gtk+.Now I have two questions.
One is how to hide cursor? I don't want to show cursor.
The other is gdk_gc_predraw error.I am telled that
"Gdk-ERROR **:file gdkgc-win32.c:line 924 (gdk_gc_predraw):
    assertion failed:(data->xgc == NULL) aborting...".
Who can tell me why ? How to solve it?
Thanks a lot!

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