Problem/Bug Trouble with bPermissions

I'm using bPermissions on my server and I'm having trouble assigning commands to roles. When I assign a player a rank they don't get the permissions. I'm new to code and I don't really know what I'm doing. I was wondering where I messed up.

This is my group.yml file

Code:

default: default
groups:
default:
  permissions:
  - essentials.chat.color
  - essentials.chat.format
  - essentials.chat.shout
  - essentials.chat.question
  meta:
    priority: '100'
    prefix: '&7[Default]''
moderator:
  permissions:
  - essentials.afk
  - essentials.build
  - essentials.compass
  - essentials.depth
  - essentials.getpos
  - essentials.geoip.show
  - essentials.help
  - essentials.ignore
  - essentials.info
  - essentials.itemdb
  - essentials.list
  - essentials.mail
  - essentials.mail.send
  - essentials.me
  - essentials.msg
  - essentials.msg.color
  - essentials.nick
  - essentials.near
  - essentials.ping
  - essentials.r
  - essentials.realname
  - essentials.seen
  - essentials.spawn
  - essentials.home
  - essentials.sethome
  - essentials.delhome
  groups:
   - default
  meta:
    priority: '200'
    prefix: '&2[Mod]'
admin:
  permissions:
  - minecraft.op
  groups:
  - moderator
  meta:
    priority: '300'
    prefix: '&4[The Best]'