How to fix JHtmlBehavior::formvalidator not found

I tried to upgrade from Joomla 3.3.6 to Joomla 3.4.1. I see this error when I try to go the admin configuration page "JHtmlBehavior::formvalidator not found". How to fix it?

Solution

I solved the issue by installing the Joomla 3.4.1 package thru' FTP upgrading and it solved the issue.

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