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 3501, in view_diff
    log_entry1 = request.repos.itemlog(p1, rev1, vclib.SORTBY_REV, 0, 1, {})[-1]
IndexError: list index out of range