bPermissions not enabled

Hello,

I have been busy in the files groups and users of bPermissions but when I join the server now it says that bPermissions is not enabled. Do you know what the problem is?

world1/group.yml

Code:

default: agamer
groups:
  default:
    permissions:
    - Signshop.Signs.Buy
    - minecraft.command.me
    - minecraft.command.help
    - minecraft.command.msg
    - bukkit.command.version
    - bukkit.command.help
    groups:
    - default
    meta:
      priority: '100'
  moderator:
    permissions:
    - group.default
    - minecraft.command.weather
    - minecraft.command.banlist
    - minecraft.command.advancement
    - minecraft.command.gamerule
    - minecraft.command.give
    - minecraft.command.list
    - minecraft.command.pardon
    - minecraft.command.pardon-ip
    - minecraft.command.playsound
    - minecraft.command.save-all
    - minecraft.command.save-off
    - minecraft.command.save-on
    - minecraft.command.say
    - minecraft.command.scoreboard
    - minecraft.command.seed
    - minecraft.command.spawnpoint
    - minecraft.command.time
    - bukkit.command.plugins
    - bukkit.command.reload
    groups:
    - moderator
    meta:
      priority: '200'
      prefix: '&b[Moderator]'
  administrator:
    permissions:
    - group.moderator
    - minecraft.command.defaultgamemode
    - minecraft.command.deop
    - minecraft.command.ban
    - minecraft.command.ban-ip
    - minecraft.command.clear
    - minecraft.command.debug
    - minecraft.command.difficulty
    - minecraft.command.effect
    - minecraft.command.enchant
    - minecraft.command.gamemode
    - minecraft.command.kick
    - minecraft.command.kill
    - minecraft.command.op
    - minecraft.command.setblock
    - minecraft.command.fill
    - minecraft.command.setidletimeout
    - minecraft.command.setworldspawn
    - minecraft.command.spreadplayers
    - minecraft.command.stop
    - minecraft.command.summon
    - minecraft.command.tellraw
    - minecraft.command.testfor
    - minecraft.command.testforblock
    - minecraft.command.toggledownfall
    - minecraft.command.tp
    - minecraft.command.whitelist
    - minecraft.command.xp
    - bukkit.command.timings
    groups:
    - operator
    meta:
      priority: '300'
      prefix: '&c[Administrator]'
  agamer:
    permissions:
    - group.default
    groups: []

world1/user.yml
users: {}