TortoiseSVN error

Exception while Reverting to earlier Revision. The intervening revisions had tree conflicts that had been resolved by replacing. Reverting to have another go at it.

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Subversion Exception!
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Subversion encountered a serious problem.
Please take the time to report this on the Subversion mailing list
(users_at_subversion.apache.org)
with as much information as possible about what
you were trying to do.
But please first search the mailing list archives for the error message
to avoid reporting the same problem repeatedly.
You can find the mailing list archives at
http://subversion.apache.org/mailing-lists.html

Subversion reported the following:

In file
'D:\Development\SVN\Releases\TortoiseSVN-1.6.16\ext\subversion\subversion\libsvn_subr\mergeinfo.c'
line 149: assertion failed (r1->start < r1->end)
Received on 2011-06-22 00:41:49 CEST