I have code at the top of my website page

I have code at the top of my website page
The first line of the php on my website page is

<? include_once("includes/session.php"); ?>

and the following code appears on the actual page
Warning: include_once(…/includes/session.php) [function.include-once]: failed to open stream: No such file or directory in /home/interior12/public_html/EnrollWebinar.php on line 1

Warning: include_once() [function.include]: Failed opening ‘…/includes/session.php’ for inclusion (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/interior12/public_html/EnrollWebinar.php on line 1

Can you please tell me how to fix this and remove the writing above?

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