安装Viewvc出错？

gaobugu

出现如下错误：
An Exception Has Occurred
Python Traceback

Traceback (most recent call last):
  File "c:\viewvc1.1\lib\viewvc.py", line 4007, in main
    request.run_viewvc()
  File "c:\viewvc1.1\lib\viewvc.py", line 400, in run_viewvc
    self.view_func(self)
  File "c:\viewvc1.1\lib\viewvc.py", line 1638, in view_roots
    allroots = list_roots(request)
  File "c:\viewvc1.1\lib\viewvc.py", line 3869, in list_roots
    cfg.utilities, cfg.options.svn_config_dir)
  File "c:\viewvc1.1\lib\vclib\svn\__init__.py", line 53, in SubversionRepository
    import svn_repos
  File "c:\viewvc1.1\lib\vclib\svn\svn_repos.py", line 27, in <module>
    from svn import fs, repos, core, client, delta
  File "C:\Python25\lib\svn\fs.py", line 19, in <module>
    from libsvn.fs import *
  File "C:\Python25\lib\libsvn\fs.py", line 5, in <module>
    import _fs
ImportError: No module named _fs
如何解决？谢谢各位