Need "Social Engine " social script EXPERT

I have Social Engine installed in my website server. I tried installing a new template, but for some reason now when I try to access website, I get the following error: Fatal error: Class 'SESession' not found in /home/phillyvi/public_html/include/[login to view URL] on line 509 I need someone that can fix this issue but also make sure the website runs perfectly with correct template. ... Please only bid if you know social engine, you need to know how it works in order to figure out their system, I already posted this project for someone in and was not able to fix with only php knowledge, this is why you need to have experience with Socialengine. if someone can help me with this , please send me a message and place your bid. Escrow for chosen programmer. Live website can now be seen ( with error ) at: [login to view URL] thanks.