Upgraded PHP to 5.4.8 - Now Getting Errors on Admin Logout

VShare v2.8.1
----------------

My host upgraded php to latest stable version PHP 5.4.8 three days back
After that I started receiving errors.

Code:

---

Fatal error: Call to undefined function mb_strtolower() in  /home/username/public_html/videos/include/functions_insert.php on line  24

---

I contacted my host and they said:
We found that the videos.site.com site was not loading because it required the mbstring extension for PHP. This is a non-standard module, and because of this was not included in the PHP upgrade. We installed it, and the site is now loading again.
So, this issue was resolved.

Now, When I try to logout from VShare Admin Dashboard, I get this error:
http://i45.tinypic.com/6ns0hc.png

Pl help resolve this issue.

Please open a support ticket with your site FTP login details.

Thanks,

Issue was fixed by VShare support.

Thank you very much !