site errors after installing wpmu

I am a previous user of backup buddy but have switched to WPMU snapshot.... when I remove the backup buddy plugin I now get the following errors on my site (see below) but when I reinstall BB they go away.... I do not have to activate BB to resolve the error and I could just leave it on my site inactivated but why do that if I am not using the plugin...

Warning: fopen(/home/cvlaundry/public_html/wp-content/plugins/backupbuddy/backupbuddy.php): failed to open stream: No such file or directory in /home/cvlaundry/public_html/wp-includes/functions.php on line 4782

Warning: fread() expects parameter 1 to be resource, boolean given in /home/cvlaundry/public_html/wp-includes/functions.php on line 4785

Warning: fclose() expects parameter 1 to be resource, boolean given in /home/cvlaundry/public_html/wp-includes/functions.php on line 4788