Permission in docs not matching pluginFixed
Can't grant myself even as owner. Plugin loaded without error, but permission doesn't exist. 
If it says that a permission doesn't exist, the plugin is not loaded generally. Check your oxide/logs for errors and make sure it is loaded.
Just read through the .cs file. Permission clause supposed to be "helicopterhover.canhover" not "helicopterhover.enable". Please change the details in the Umod.
Looks like you are right!

Not sure how I missed this thread but it is now fixed.

Locked automatically