I am facing some problem with my php session. I have deployed a plugin for file management in my moodle application.
The new plugin home page is behaving unexpected
Actually PHP_Incomplete_Class_Name has nothing to do with session regeneration.
This behaviour appears when you (or your cms/framework/whatever you have) call session_start() before each serialized object's class definition has been parsed.
So you need to include all classes before you started session.