Question Allowing /trigger for default users through PEX

I've made a command block teleport system, that makes use of the minecraft vanilla command /trigger, but players on my server gets the "I'm sorry, but you dont have permssion to perform this command, Please contact the server admin......." I tried to add minecraft.trigger essentials.trigger bukkit.command.trigger to my permissionsex file but none of them have worked. Is there a way to allow my players to use the /trigger command.