Problem/Bug Command and Aliases not Working Properly

I'm running a Bukkit Server and I want to separate the Help Menu from OPs and Players. I have PermissionEX installed. Here is what I have:

Commands.yml:
aliases:
helpx:
- bukkit:help
help:
- minecraft:help

(PermissionEX's) Permissions.yml:
groups:
default:
permissions: []
Survival:
options:
default: 'true'
permissions:
- bukkit.command.tell
- minecraft:help
- -bukkit.command.plugins
- -bukkit.command.version


but when I type in /help or /minecraft:help it tells my I do not have permission to do that. Does anyone know what I have done wrong?