An Exception Has Occurred

Python Traceback

Traceback (most recent call last):
  File "/usr/lib/viewvc/lib/viewvc.py", line 4855, in main
    request.run_viewvc()
  File "/usr/lib/viewvc/lib/viewvc.py", line 408, in run_viewvc
    self.view_func(self)
  File "/usr/lib/viewvc/lib/viewvc.py", line 3486, in view_diff
    p1, p2, rev1, rev2, sym1, sym2 = setup_diff(request)
  File "/usr/lib/viewvc/lib/viewvc.py", line 3378, in setup_diff
    rev1 = r1 = query_dict['r1']
KeyError: 'r1'