Traceback (most recent call last): File "/usr/local/grass-6.5.svn/etc/wxpython/gui_modules/gd ialogs.py", line 528, in OnOK self.parent.MapWindow.UpdateMap() File "/usr/local/grass-6.5.svn/etc/wxpython/gui_modules/ma pdisp_window.py", line 840, in UpdateMap for img in self.GetOverlay(): File "/usr/local/grass-6.5.svn/etc/wxpython/gui_modules/ma pdisp_window.py", line 699, in GetOverlay if os.path.isfile(overlay.mapfile) and os.path.getsize(overlay.mapfile): File "/usr/lib/python2.6/genericpath.py", line 29, in isfile st = os.stat(path) TypeError : coercing to Unicode: need string or buffer, NoneType found