Error notification

Hi guys sorry to bother you again but I've searched the support on .org on this and although I found some topics about this problem I wasn't able to resolve it...

When the plugin is activated I get thefollowing message after registring a new website on the multisite:

Warning: fopen(/home/jaaadesignwebsitehosting.nl/public_html/wp-content/plugins/EMPTY) [function.fopen]: failed to open stream: No such file or directory in /home/jaaadesignwebsitehosting.nl/public_html/wp-includes/functions.php on line 3306

Warning: fread() expects parameter 1 to be resource, boolean given in /home/jaaadesignwebsitehosting.nl/public_html/wp-includes/functions.php on line 3309

Warning: fclose() expects parameter 1 to be resource, boolean given in /home/jaaadesignwebsitehosting.nl/public_html/wp-includes/functions.php on line 3312
Je account is nu actief!
Gebruikersnaam: xxxxx

Wachtwoord: Xxxxx

Je account is nu geactiveerd. Bekijk je site of Login

Is there a fix for this? Thank you,

Nick