Problem in functions.php

Hi !
I recently updated my version of wordpress to 3.1.4 but having one trouble with my functions.php file that the my wordpress is giving error about a plugin which i have deleted a few months before i cant understand it.The wordpress is giving the following error

Warning: fopen(/home/content/i/n/e/ineteye/html/pakigeneration/wp-content/plugins/post-plugin-library/post-plugin-library.php) [function.fopen]: failed to open stream: No such file or directory in /home/content/i/n/e/ineteye/html/pakigeneration/wp-includes/functions.php on line 4284

Warning: fread(): supplied argument is not a valid stream resource in /home/content/i/n/e/ineteye/html/pakigeneration/wp-includes/functions.php on line 4287

Warning: fclose(): supplied argument is not a valid stream resource in /home/content/i/n/e/ineteye/html/pakigeneration/wp-includes/functions.php on line 4290