pex prefix errors

groups:
  Default:
    default: true
    prefix: '&2[Travaler]&f'
    permissions:
    - iConomy.access
    - iConomy.payment
    - iConomy.list
    - essentials.afk
    - essentials.list
    - essentials.msg
    - essentials.rules
    - essentials.spawn
    options:
      rank: '800'
    build: false
  Builder:
    default: false
    prefix: '&e[B]&f'
    permissions:
    - essentials.fly
    - essentials.gamemode
    - worldedit.*
    options:
      rank: '700'
    build: true
    inheritance:
    - default
    worlds:
      user:
        permissions:
        - kman0323
  Moderator:
    default: false
    prefix: '&5[M]&f'
    permissions:
    - essentials.afk
    - essentials.ban
    - essentials.ban.exempt
    - essentials.fly
    - essentials.kick
    - essentials.mute
    - essentials.rules
    - essentials.spawn
    - essentials.tempban
    - essentials.tp.others
    - essentials.vanish
    options:
      rank: '600'
    build: false
    inheritance:
    - default
  Admin:
    default: false
    prefix: '&c[A]&f'
    permissions:
    - essentials.*
    options:
      rank: '500'
    build: true
    inheritance:
    - Moderator
    - Builder
    worlds:
      user:
        permissions:
        - kman0323
  Owner:
    default: false
    prefix: '&4[O]&f'
    permissions:
    - '*'
    options:
      rank: '1'
    build: true
users:
  kman0323:
    group:
    - Owner