TortoiseSVN revision graph error "Graphs for repository roots are always empty!"

I checkout repository and revision graph,report error: "Graphs for repository roots are always empty!",after click "OK" don't show any graph only "No graph available".
I found TortoiseSVN 1.7.1/1.7.2 report this error, but TortoiseSVN 1.6.8/1.6.16 can work normal.
I had tested checkout from server Collabnet Subversion Edge 2.1.1 and Collabnet Subversion 1.6.8,and tested checkout from public svn repository (http://svn.edgewall.com/repos/trac/),all report error.

Client OS: Windows XP Professional SP3 zh_cn
SVN Client: TortoiseSVN 1.7.1 / 1.7.2
SVN Server: Collabnet Subversion Edge 2.1.1 /Collabnet Subversion 1.6.11

Email ：tswang_at_nantian.com.cn
         wangtaisong_at_126.com

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Received on 2011-12-06 07:56:44 CET