Merging to branches error

Hi,

I installed tortoise 1.7 64-bit version on Win 7.

I am getting the below error constantly while trying to commit or merge to branches.

What should I do?

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

In file
'D:\Development\SVN\Releases\TortoiseSVN-1.7.0\ext\subversion\subversion\libsvn_wc\wc_db.c'
line 7393: internal malfunction
---------------------------
OK
---------------------------

Dimitry Gavrilov
Senior Lead Engineer

[Description: Description: secure_connection2]