PEX problem please help

Hey heres my config. My server is 1.8.8
I cant add prefix and i cant put player in groups. i do /pex user IGN gorup set Owner and /pex user IGN add permissions.* but doesnt work. PLEASE HELP

Config:

Code:

groups:
  default: Member
 Member:  
    options:
      default: true
      prefix: '&2[&aMember&2]&7'
      build: true
    permissions:
    - essentials.balance   
    - essentials.pay   
    - essentials.sell   
    - essentials.afk   
    - essentials.afk.kickexempt   
    - essentials.help   
    - essentials.helpop   
    - essentials.ignore   
    - essentials.info   
    - essentials.list   
    - essentials.mail   
    - essentials.mail.send   
    - essentials.me   
    - essentials.msg   
    - essentials.rules   
    - essentials.seen   
    - essentials.enderchest   
    - essentials.spawn   
    - essentials.back.ondeath   
    - essentials.back   
    - essentials.home   
    - essentials.sethome   
    - essentials.tpa   
    - essentials.tpaccept   
    - essentials.tpdeny   
    - essentials.warp   
    - essentials.warp.list   
    - modifyworld.*
 Owner:
    options:
     default: false
     prefix: 'b&l&oOWNER'
     build: true
    permissions:
    - '*'
  Dev:
    options:
     default: false
     prefix: 'b&l&oDEVELOPER'
     build: true
   permissions:
   - '*'
  Admin: 
    options:
     default: false
     prefix: '&c&l&oADMIN'
     build: true
    permissions:
    - '*'
schema-version: 1

 

You are not allowed to use this permission and aslo prefix doesnt work

 

I have ChatManager and EssentialsX. I tried console but nothing

 

@Player769 I believe that the Chat Formatting requires Vault. Do you have that installed as well?