Gato (Graph Animation Toolbox)

Hi!
When i try to run window for drawing graphs i obtain the following error:

Exception in Tkinter callback
Traceback (most recent call last):
File "/usr/lib/python2.4/lib-tk/Tkinter.py", line 1345, in __call__
return self.func(*args)
File "/usr/bin/gato", line 539, in NewGraph
Gred.Start()
File "/usr/lib/gato/Gred.py", line 880, in __init__
graphEditor = SAGraphEditorToplevel()
File "/usr/lib/gato/Gred.py", line 838, in __init__
self.makeMenuBar(1)
File "/usr/lib/gato/Gred.py", line 378, in makeMenuBar
if self.windowingsystem == 'aqua':
AttributeError: SAGraphEditorToplevel instance has no attribute
'windowingsystem'

I'm running on Gentoo Linux, Python 2.4 and gato-0.99. Version 0.98p of
gato worked fine for me.

Greetings
Marek