Can you see the problem?

I'm using permissionsEx and I had a list of permissions made and when I put it in and type /pex in-game I receive the message ' an internal error occurred while attempting to perform this command' When I then put the original stuff in it then works. Could you tell me what below is incorrect causing this to happen.

Code:

groups:
  Traveler:
    default: true
    permissions:
    - modifyworld.*
    - essentials.afk
    - essentials.spawn
    - essentials.tpa
    - essentials.motd
    - essentials.mail
    - essentials.mail.send
    - essentials.help
    options:
      rank: '100'
    prefix: '&0(&dTraveler&0)&7 '
  Citizen:
    permissions:
    - modifyworld.*
    inheritance:
    - Traveler
    options:
      rank: '99'
    prefix: '&0(&8Citizen&0)&7 '
  Crafter:
    permissions:
    - modifyworld.*
    - essentials.fly
    - ChestShop.shop.*
    - essentials.back
    inheritance:
    - Citizen
    options:
      rank: '98'
    prefix: '&0(&6Crafter&0)&7 '
  Miner:
    permissions:
    - essentials.god
    - essentials.heal
    - essentials.feed
    inheritance:
    - Crafter
    options:
      rank: '97'
    prefix: '&0(&eMiner&0)&7 '
  Builder:
    permissions:
    - essentials.sethome
    - essentials.home
    - essentials.clearinventory
    - mobdisguise.*
    inheritance:
    - Miner
    options:
      rank: '96'
    prefix: '&0(&eBuilder&0)&7 '
  Mason:
    permissions:
    - worldedit.superpickaxe
    - essentials.top
    - essentials.jump
    - essentials.setwarp
    - essentials.delwarp
    - essentials.warp
    - essentials.warp.list
    inheritance:
    - Builder
    options:
      rank: '95'
    prefix: '&0(&6Mason&0)&7 '
  Guild:
    permissions:
    - worldedit.butcher
    inheritance:
    - Mason
    options:
      rank: '94'
    prefix: '&0(&1Guild&0)&7 '
  Elite:
    permissions:
    - essentials.me
    inheritance:
    - Guild   
    options:
      rank: '93'
    prefix: '&0(&1Elite&0)&7 '
  Knight:
    permissions:
    - essentials.time.*
    - essentials.time.set
    inheritance:
    - Elite
    options:
      rank: '92'
    prefix: '&0(&eKnight&0)&7 '
  Infinite:
    permissions:
    - essentials.gamemode
    inheritance:
    - Knight
    options:
      rank: '91'
    prefix: '&0(&eInfinite&0)&7 '
  Moderator:
    permissions:
    - '*'
    inheritance:
    - Infinite
    options:
      rank: '90'
    prefix: '&0(&bModerator&0)&7 '
  Admin:
    permissions:
    - '*'
    inheritance:
    - Infinite
    options:
      rank: '89'
    prefix: '&0(&bAdmin&0)&7 '
  Co-Owner:
    permissions:
    - '*'
    inheritance:
    - Infinite
    options:
      rank: '2'
    prefix: '&0(&2Co-Owner&0)&7 '
  Owner:
    permissions:
    - '*'
    inheritance:
    - Infinite
    options:
      rank: '1'
    prefix: '&0(&4Owner&0)&4 '
users:
 
 
 
 

Fixed.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.