Grail won't work

[Nick Bower]

I just installed Grail 0.6 to take a look.  I have Py1.5 and Tk8 but it
won't run:

Traceback (innermost last):
  File "d:\grail-0.6\grail.py", line 499, in ?
    main()
  File "d:\grail-0.6\grail.py", line 150, in main
    from Browser import Browser
  File "D:\grail-0.6\Browser.py", line 26, in ?
    _mydir = os.path.dirname(grailutil.abspath(__file__))
  File "D:\grail-0.6\utils\grailutil.py", line 22, in abspath
    if not isabs(path):
NameError: isabs

What does this mean?  Cheers, Nick.