Unable to activate Pro Version

Hi Guys,

today we’ve purchased the Pro version of your plugin. Unfortunately we are not able to activate because of the following error in WP backend:

Fatal error: Cannot redeclare IksStudio\IKSM\iks_menu_fs() (previously declared in /usr/local/www/apache24/noexec/switchpay-docs.dev-sites.org/wp-content/plugins/iks-menu/iks-menu.php:44) in /usr/local/www/apache24/noexec/switchpay-docs.dev-sites.org/wp-content/plugins/iks-menu-pro/iks-menu.php on line 42

Please advise.

Thanks