cssdev error

I like the cssdev script and recently ran into this error. I was wondering if anyone else has seen it and if there is a fix?

Traceback (most recent call last):
File "/tmp/skl/Gimp.app/Contents/Resources/lib/gimp/2.0/python/gimpfu.py", line 685, in response
dialog.res = run_script(params)
File "/tmp/skl/Gimp.app/Contents/Resources/lib/gimp/2.0/python/gimpfu.py", line 352, in run_script
return apply(function, params)
File "/tmp/skl/Gimp.app/Contents/Resources/lib/gimp/2.0/plug-ins/cssdev", line 231, in python_cssdev
layer_bg = active_image.layers[this_layer].get_pixel(xpos,ypos)
error: could not get pixel (30, 30) on drawable (ID 34)

I am using version 2.6 on OS X Tiger.

Best Regards,
Andre