Subversion Exception!-line 1619: internal malfunction

I got the following error when 'svn diff with url' from tortoisesvn right click.
Please help.

Also when trying to show 'svn log' I'm getting: RA layer request failed svn: Unexpected HTTP status 501 'Method Not Implemented' on
Surprisingly enough when doing just regular: 'check for modifications' or 'diff' it works fine.

---------------------------
Subversion Exception!
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Subversion encountered a serious problem.
Please take the time to report this on the Subversion mailing list
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
(you can copy the content of this dialog
to the clipboard using Ctrl-C):

In file
 'D:\Development\SVN\Releases\TortoiseSVN-1.8.1\ext\subversion\subversion\libsvn_wc\diff_editor.c'
 line 1619: internal malfunction
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OK
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Received on 2013-08-06 23:20:01 CEST