An Exception Has Occurred

Python Traceback

Traceback (most recent call last):
  File "../../lib/viewcvs.py", line 2487, in main
    request.run_viewcvs()
  File "../../lib/viewcvs.py", line 256, in run_viewcvs
    import vclib.svn
  File "../../lib/vclib/svn/__init__.py", line 27, in 
    from svn import fs, repos, core, delta
ImportError: No module named svn