PHP Fatal error call a member function force_update_all()

hi
i’ve this error

[Sat Jun 22 13:54:26 2013] [error] [client 66.249.74.222] PHP Fatal error:  Allowed memory size of 134217728 bytes exhausted (tried to allocate 83 bytes) in /home/www/www.q8feed.net/htdocs/wp-includes/post.php on line 595
[Sat Jun 22 14:14:49 2013] [error] [client 62.150.93.217] PHP Fatal error:  Allowed memory size of 134217728 bytes exhausted (tried to allocate 83 bytes) in /home/www/www.q8feed.net/htdocs/wp-includes/post.php on line 595, referer: https://www.google.com.sa/
[Sat Jun 22 15:16:26 2013] [error] [client 62.150.164.39] PHP Fatal error:  Call to a member function force_update_all() on a non-object in /home/www/www.q8feed.net/htdocs/wp-content/plugins/feedwordpress/syndicatedlink.class.php on line 82, referer: http://www.q8feed.net/wp-admin/plugins.php
[Sat Jun 22 16:03:29 2013] [error] [client 178.253.66.27] PHP Fatal error:  Allowed memory size of 134217728 bytes exhausted (tried to allocate 81 bytes) in /home/www/www.q8feed.net/htdocs/wp-includes/post.php on line 595, referer: https://www.google.com/
[Sat Jun 22 16:15:56 2013] [error] [client 62.150.164.39] PHP Fatal error:  Call to a member function force_update_all() on a non-object in /home/www/www.q8feed.net/htdocs/wp-content/plugins/feedwordpress/syndicatedlink.class.php on line 82, referer: http://www.q8feed.net/wp-admin/plugins.php?deactivate=true&plugin_status=all&paged=1&s=

PHP 5.3.3-7+squeeze15 with Suhosin-Patch (cli) (built: Mar 4 2013 13:11:17)
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