Python Exception Occurred

Traceback (most recent call last):
  File "/home/rizwank/geekymedia.com/viewcvs/lib/viewcvs.py", line 2625, in run_cgi
    main()
  File "/home/rizwank/geekymedia.com/viewcvs/lib/viewcvs.py", line 2578, in main
    view_directory(request)
  File "/home/rizwank/geekymedia.com/viewcvs/lib/viewcvs.py", line 1144, in view_directory
    fileinfo, alltags = get_logs(full_name, rcs_files, view_tag)
  File "/home/rizwank/geekymedia.com/viewcvs/lib/viewcvs.py", line 1076, in get_logs
    rlog = popen.popen(os.path.normpath(os.path.join(cfg.general.rcs_path,'rlog')), chunk, 'r')
  File "/home/rizwank/geekymedia.com/viewcvs/lib/popen.py", line 33, in popen
    pid = os.fork()
OSError: [Errno 11] Resource temporarily unavailable