Function errors on Site creation

I tried to create a site in the network admin
The page went white then the following.

Warning: fopen(/home/knigdnet/public_html/wp-content/plugins/EMPTY) [function.fopen]: failed to open stream: No such file or directory in /home/knigdnet/public_html/wp-includes/functions.php on line 3508

Warning: fread() expects parameter 1 to be resource, boolean given in /home/knigdnet/public_html/wp-includes/functions.php on line 3511

Warning: fclose() expects parameter 1 to be resource, boolean given in /home/knigdnet/public_html/wp-includes/functions.php on line 3514

Warning: Cannot modify header information - headers already sent by (output started at /home/knigdnet/public_html/wp-includes/functions.php:3508) in /home/knigdnet/public_html/wp-includes/pluggable.php on line 876

It send the email, added the site to the list. The actual site is not there.
Please help.
Richard