Help with yml code

Done this before, but i don't know whats wrong with it. Id greatly appreciate if you fixed it for me.
groups:
default:
default: true
build: true
prefix: '&2[Player]&f
permissions:
- essentials.pay
- essentials.sell
- essentials.worth
- essentials.afk.kickexempt
- essentials.help
- essentials.helpop
- essentials.me
- essentials.motd
- essentials.msg
- essentials.rules
- essentials.suicide
- essentials.back
- essentials.back.ondeath
- essentials.sethome
- essentials.home
- essentials.tpa
- essentials.tpaccept
- essentials.tpdeny
- essentials.warp.list
- essentials.warp.*
- essentials.teleport.cooldown.bypass
- essentials.spawn
- essentials.kit
- essentials.kit.[Starter]
- essentials.nocommandcost.all
Builder:
build: true
inheritance:
- default
prefix: '[Builder]'
permissions:
- essentials.gamemode
- essentials.give
- essentials.repair
- essentials.repair.armor
- essentials.repair.enchanted
- essentials.tp.others
Moderator:
build: true
inheritance:
- default
- Builder
prefix: '&4[Mod]&f
permissions:
- essentials.*
- -essentials.bigtree
- -essentials.fireball
- -essentials.banip
- -essentials.unbanip
- -essentials.nuke
- -essentials.god
Admin:
build: true
inheritance:
- default
- Builder
- Moderator
prefix: '&6[Admin]&f
permissions:
- essentials.*
- -essentials.bigtree
- -essentials.fireball
- -essentials.nuke
Co-owner:
build: true
inheritance:
- default
- Builder
- Moderator
- Admin
prefix: '&5[Co-Owner]&f
permissions:
- '*'
Co-owner:
build: true
inheritance:
- default
- Builder
- Moderator
- Admin
- Co-owner
prefix: '&9[Owner]&f
permissions:
- '*'