viewvc点进仓库 的时候报错，求解决办法

leaflower

An Exception Has Occurred Python Traceback

Traceback (most recent call last):
  File "C:\viewvc\lib\viewvc.py", line 4471, in main    request.run_viewvc()
  File "C:\viewvc\lib\viewvc.py", line 267, in run_viewvc    self.repos.open()
  File "C:\viewvc\lib\vclib\svn\svn_repos.py", line 406, in open    self.repos = repos.svn_repos_open(self.rootpath)
  File "C:\Python25\Lib\site-packages\libsvn\repos.py", line 47, in svn_repos_open    return apply(_repos.svn_repos_open, args)
SubversionException: ("Expected FS format between '1' and '3'; found format '4'", 160043)

msnshow

查看这个文件C:\viewvc\lib\viewvc.py  出错提示中的行的代码，看看能看出是什么错不