Error in upgradation to Subversion 1.7

Hello,

  I recently upgraded to subversion 1.7 and upgraded my working
project copy to make it compatible with 1.7. I frequently face the
below error whenever, I try to update my working copy and the working
folder gets locked and I find it hard to release the lock as it
complains the working folder is not a working copy. I tried with
Tortoise SVN and subclipse 1.8 from eclipse.

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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
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-1.7.1\ext\subversion\subversion\libsvn_wc\update_editor.c'
 line 2898: assertion failed (status != svn_wc__db_status_normal)
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OK
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-- 
Regards,
JayaKishnan V