Python Exception Occurred

Traceback (most recent call last):
  File "/home/lace/viewcvs-0.9.4/lib/viewcvs.py", line 2630, in run_cgi
    main()
  File "/home/lace/viewcvs-0.9.4/lib/viewcvs.py", line 2583, in main
    view_directory(request)
  File "/home/lace/viewcvs-0.9.4/lib/viewcvs.py", line 1117, in view_directory
    file_data = get_file_data(full_name)
  File "/home/lace/viewcvs-0.9.4/lib/viewcvs.py", line 681, in get_file_data
    files = os.listdir(full_name)
OSError: [Errno 13] Permission denied: '/home/lace/pserver/cvs/priv'