Forum Patch 4.0.2 error
 

I'm getting this error :
Fatal error: Call to undefined method vB_Input_Cleaner::utf8_clean() in /homepages/3/d272811174/htdocs/mywebsite.com/forum/includes/class_friendly_url.php on line 311
I'm running Ver . 4.0.1
after these files from Patch 4.0.2 are overwritten ,I get the error .

includes/class_core.php
includes/functions_forumdisplay.php
includes/functions.php
includes/version_vbulletin.php
vb/legacy/thread.php


Any help?
Thanks

Is it necessary to run a upgrade script after overwriting the files?