problem setting up viewvc with tomcat

I have setup viewvc on windows 2003 using tomcat. However, whenever i 
try to view a module in cvs i get the following
An Exception Has Occurred
Python Traceback

Traceback (most recent call last):
  File "C:\Program Files\viewvc-1.0.0\lib\viewvc.py", line 3611, in main
    request.run_viewvc()
  File "C:\Program Files\viewvc-1.0.0\lib\viewvc.py", line 388, in 
run_viewvc
    self.view_func(self)
  File "C:\Program Files\viewvc-1.0.0\lib\viewvc.py", line 1541, in 
view_directory
    request.repos.dirlogs(request.path_parts, request.pathrev, 
file_data, options)
  File "C:\Program Files\viewvc-1.0.0\lib\vclib\bincvs\__init__.py", 
line 195, in dirlogs
    alltags = _get_logs(self, dirpath, entries, rev, subdirs)
  File "C:\Program Files\viewvc-1.0.0\lib\vclib\bincvs\__init__.py", 
line 881, in _get_logs
    rlog = repos.rcs_popen('rlog', args, 'rt')
  File "C:\Program Files\viewvc-1.0.0\lib\vclib\bincvs\__init__.py", 
line 255, in rcs_popen
    return popen.popen(cmd, args, mode, capture_err)
  File "C:\Program Files\viewvc-1.0.0\lib\popen.py", line 71, in popen
    phandle, pid, thandle, tid = win32popen.CreateProcess(command, 
hStdIn, hStdOut, hStdErr)
  File "C:\Program Files\viewvc-1.0.0\lib\win32popen.py", line 74, in 
CreateProcess
    si                               # startupinfo
error: (2, 'CreateProcess', 'The system cannot find the file specified.')

I have checked all the paths in viewvc.conf and they are correct. what 
am i still missing?
thanks