WordPress warning upon plugin activation

When I activate your plugin with Debug On I get: “Notice: register_uninstall_hook was called incorrectly. Only a static class method or function can be used in an uninstall hook. Please see Debugging in WordPress for more information. (This message was added in version 3.1.) in /var/www/vhosts/m… on line 3622”
I suppose this is something you have to look at.

https://www.ads-software.com/plugins/mojo-under-construction/