An Exception Has Occurred
Python Traceback

Traceback (most recent call last):
  File "/sites/svn/viewvc/lib/viewvc.py", line 3655, in main
    request.run_viewvc()
  File "/sites/svn/viewvc/lib/viewvc.py", line 387, in run_viewvc
    self.view_func(self)
  File "/sites/svn/viewvc/lib/viewvc.py", line 2740, in view_diff
    fp = request.repos.rawdiff(p1, rev1, p2, rev2, diff_type, diff_options)
  File "/sites/svn/viewvc/lib/vclib/svn/__init__.py", line 638, in rawdiff
    return vclib._diff_fp(temp1, temp2, info1, info2, self.diff_cmd, args)
  File "/sites/svn/viewvc/lib/vclib/__init__.py", line 259, in __init__
    self.fp = popen.popen(diff_cmd, args, "r")
  File "/sites/svn/viewvc/lib/popen.py", line 97, in popen
    null = os.open('/dev/null', os.O_RDWR)
OSError: [Errno 5] Input/output error: '/dev/null'