Ad widget cannot Network Activate -- fata error

I'm running WP 3.1, been trying to update all premium plugins and themes since you did the install...

Updated Ad widget to v2.1 -- here's the error I get when I try to Network Activate:

Fatal error: Cannot redeclare class adlitewidget in /home/racreprt/public_html/wp-content/plugins/ad-widget/adwidget-lite.php on line 254

I tried to comment out that line in the php file, and no joy -- it throws more errors.