An Exception Has Occurred

Python Traceback

Traceback (most recent call last):
  File "/usr/local/viewvc-1.0.0/lib/viewvc.py", line 3611, in main
    request.run_viewvc()
  File "/usr/local/viewvc-1.0.0/lib/viewvc.py", line 253, in run_viewvc
    import vclib.svn
  File "/usr/local/viewvc-1.0.0/lib/vclib/svn/__init__.py", line 25, in ?
    from svn import fs, repos, core, delta
ImportError: No module named svn