Why can’t I create folder ??

Dear sir ,

Could you kindly advise me ?
Why can’t I create folder in http://urc-epasc01.hgst.com/fw/ccb7_mfg/dev_branches/users ?

Error notice as below message.

---------------------------
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-1.8.6\ext\subversion\subversion\libsvn_subr\dirent_uri.c'
line 1571: assertion failed (! svn_path_is_url(relative))
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OK
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Piyaporn Settabunjong (Lek)
Spacing Control, Sustaining RSS
HGST, a Western Digital company
piyaporn.settabunjong_at_hgst.com<mailto:piyaporn.settabunjong_at_hgst.com>
Tel: +66 37 270 500 Ext. 612721
[HGST_Logo_email (1)]
203, 205 M.7, ThaTum, Srimahaphote, Prachinburi 25140
www.hgst.com<http://www.hgst.com/>