Error logging into systemanagement hub after creating plugin

I tried to create a pluggin to import files into centrasite.
So i created the a new folder in the path C:\Documents and Settings\All Users\Application Data\Software AG\Tomcat\cp8.0\webapps\PluggableUI

and then created a java project in eclipse(defined needed class files etc as instructed in the dg-plug doc) and when i completed it was instructed to restart the tomcat server for the changes to reflect in centrasite,

After restarting the tomcat server when i tried to open the system management hub and centrasite am getting a session timeout error,
it does not direct me to the login page where we provide our credentials

Is this problem because of the pluggin that i have created ?

Attached the error that is generated

Anusha S