http://www.icyphoenix.com/viewtopic.php?f=35&t=8474&p=55547#p55547
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Joshua203
Fri 13 Apr, 2012 16:45

Re: Fatal Error: Call To Undefined Function Session_pagestart() In /index.php - /pagestart.php - /erc.php
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Hi Jihuatz,

If you did not change anything maybe by accident you deleted or moved something?
I would start by checking if the includes folder is in the root of your forum if yes ..then check the content (especially sessions.php, functions.php and functions_dbmtnc.php)

Upload them fresh if any of them is missing