I am receiving several error codes at the top of my dashboard...?

SInce I have installed the plugin I am receiving 3 error codes at the top of my dashboard:

1. Warning: fopen(/home/content/78/9842478/html/wp-content/plugins/membership/membership.php) [function.fopen]: failed to open stream: No such file or directory in /home/content/78/9842478/html/wp-includes/functions.php on line 3306

2. Warning: fread() expects parameter 1 to be resource, boolean given in /home/content/78/9842478/html/wp-includes/functions.php on line 3309

3. Warning: fclose() expects parameter 1 to be resource, boolean given in /home/content/78/9842478/html/wp-includes/functions.php on line 3312

Please help, thanks.