I get the following traceback when I do "archive" then "order"

Traceback (most recent call last):
File "/cygdrive/g/yagtd/src/yagtd.py", line 1106, in <module>
main(options, args[0])
File "/cygdrive/g/yagtd/src/yagtd.py", line 1073, in main
gtd_cmd.cmdloop()
File "/usr/lib/python2.5/cmd.py", line 142, in cmdloop
stop = self.onecmd(line)
File "/usr/lib/python2.5/cmd.py", line 219, in onecmd
return func(arg)
File "/cygdrive/g/yagtd/src/yagtd.py", line 858, in do_order
for c, ts in self.todo.order(attr).items():
AttributeError: 'list' object has no attribute 'order'