HELP PERMISSIONS PLEASE!

I have installed a plugin, And whenever they type in this command it says they don't have permission.I get the hang of permissions kinda, and i have the permission node that makes the command available for the players but i put the node in and it dosnt work

THE PROBLEM IS THE "HungerArena.Join" for the default, IT WONT WORK
# PermissionsBukkit configuration file
#
# A permission node is a string like 'permissions.build', usually starting
# with the name of the plugin. Refer to a plugin's documentation for what
# permissions it cares about. Each node should be followed by true to grant
# that permission or false to revoke it, as in 'permissions.build: true'.
# Some plugins provide permission nodes that map to a group of permissions -
# for example, PermissionsBukkit has 'permissions.*', which automatically
# grants all admin permissions. You can also specify false for permissions
# of this type.
#
# Users inherit permissions from the groups they are a part of. If a user is
# not specified here, or does not have a 'groups' node, they will be in the
# group 'default'. Permissions for individual users may also be specified by
# using a 'permissions' node with a list of permission nodes, which will
# override their group permissions. World permissions may be assigned to
# users with a 'worlds:' entry.
#
# Groups can be assigned to players and all their permissions will also be
# assigned to those players. Groups can also inherit permissions from other
# groups. Like user permissions, groups may override the permissions of their
# parent group(s). Unlike users, groups do NOT automatically inherit from
# default. World permissions may be assigned to groups with a 'worlds:' entry.
users:
ConspiracyWizard:
permissions:
permissions.example: true
groups:
- admin
kittenownage:
groups:
- admin
belimicgerbils:
groups:
- admin
ghost109:
groups:
- admin
groups:
default:
permissions:
- HungerArena.Join: true
- chest.open: true
admin:
permissions:
permissions.*: true
inheritance:
- KittenOwnage
user:
permissions:
permissions.build: true
worlds:
creative:
coolplugin.item: true
inheritance:
- default
messages:
build: '&cYou do not have permission to build here.'
debug: false
If your gonna try something to put in there im not stupid, btw