Fatal error activating support system

Hi

I had an old version of support system installed in MU-plugins. I deleted it and then uploaded the latest version to plugins folder and network activated. It gives a fatal error:

Fatal error: Cannot redeclare incsub_support_menu() in /home/fm2011/public_html/wp-content/plugins/incsub-support/incsub-support.php on line 303

Please advise.