when ever I try to add a game to favorites I get this error

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Warning: include_once(./common.PHP_EXT) [function.include-once]: failed to open stream: No such file or directory in /home/parahunt/public_html/IP/activity_favs.php on line 22

Warning: include_once() [function.include]: Failed opening './common.PHP_EXT' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/parahunt/public_html/IP/activity_favs.php on line 22

Warning: include_once(./ACTIVITY_MOD_PATHincludes/functions_amod_plus.PHP_EXT) [function.include-once]: failed to open stream: No such file or directory in /home/parahunt/public_html/IP/activity_favs.php on line 23

Warning: include_once() [function.include]: Failed opening './ACTIVITY_MOD_PATHincludes/functions_amod_plus.PHP_EXT' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/parahunt/public_html/IP/activity_favs.php on line 23

Warning: include_once(./includes/bbcode.PHP_EXT) [function.include-once]: failed to open stream: No such file or directory in /home/parahunt/public_html/IP/activity_favs.php on line 24

Warning: include_once() [function.include]: Failed opening './includes/bbcode.PHP_EXT' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/parahunt/public_html/IP/activity_favs.php on line 24

Fatal error: Call to undefined function session_pagestart() in /home/parahunt/public_html/IP/activity_favs.php on line 27