PermissionsEX Help.

I have only just updated my PEX Yml file to include permissions! But whenever I start the server I see this:
[02-09-2017 11:34:09] Caused by: ru.tehkode.permissions.exceptions.PermissionsNotAvailable: Permissions manager is not accessable. Is the PermissionsEx plugin enabled?
[02-09-2017 11:34:09] at ru.tehkode.permissions.bukkit.PermissionsEx.getPermissionManager(PermissionsEx.java:405) ~[?:?]
[02-09-2017 11:34:09] at net.milkbowl.vault.permission.plugins.Permission_PermissionsEx.getUser(Permission_PermissionsEx.java:243) ~[?:?]
[02-09-2017 11:34:09] at net.milkbowl.vault.permission.plugins.Permission_PermissionsEx.getPrimaryGroup(Permission_PermissionsEx.java:264) ~[?:?]
[02-09-2017 11:34:09] at net.milkbowl.vault.permission.Permission.getPrimaryGroup(Permission.java:738) ~[?:?]
[02-09-2017 11:34:09] at com.earth2me.essentials.perm.impl.AbstractVaultHandler.getGroup(AbstractVaultHandler.java:33) ~[?:?]
[02-09-2017 11:34:09] at com.earth2me.essentials.perm.PermissionsHandler.getGroup(PermissionsHandler.java:28) ~[?:?]
[02-09-2017 11:34:09] at com.earth2me.essentials.User.getGroup(User.java:624) ~[?:?]
[02-09-2017 11:34:09] at com.earth2me.essentials.User.canBuild(User.java:645) ~[?:?]
[02-09-2017 11:34:09] at com.earth2me.essentials.antibuild.EssentialsAntiBuildListener.onPlayerInteract(EssentialsAntiBuildListener.java:184) ~[?:?]
[02-09-2017 11:34:09] at sun.reflect.GeneratedMethodAccessor148.invoke(Unknown Source) ~[?:?]
[02-09-2017 11:34:09] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_131]
[02-09-2017 11:34:09] at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_131]
[02-09-2017 11:34:09] at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:296) ~[craftbukkit.jar:git-Bukkit-ed8c725]
[02-09-2017 11:34:09] ... 18 more
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Here is my .YML also.

groups:
Default
default: true
build: true
prefix: '&7[Member]&f'
permissions
- essentials.help
- modifyworld.chat
- modifyworld.*
- essentials.home
- essentials.sethome
- essentials.back
- essentials.tpa
- essentials.tpaccept
- essentials.tpdeny
- essentials.spawn
- essentials.warp
- essentials.warp.list
Donator
build: true
inheritance:
- Default
prefix: '&6[Donator]&f'
permissions:
- essentials.enchant
- essentials.repair
Jr-Moderator:
build: false
inheritance:
- Default
prefix: '&6[JR-MODERATOR]&6'
suffix: '&7'
permissions:
- essentials.repair
- essentials.heal
- essentials.item
- essentials.give
- essentials.fly
- essentials.kick
- essentials.mute
- essentials.tjail
- essentials.jail
- essentials.tempban
- essentials.vanish
Moderator:
build: false
inheritance:
- Default
- Jr-Moderator
prefix: '&6[Moderator]&6'
suffix: '&7'
permissions:
- essentials.repair
- essentials.heal
- essentials.item
- essentials.give
- essentials.fly
- essentials.kick
- essentials.mute
- essentials.tjail
- essentials.jail
- essentials.tempban
- essentials.vanish
Sr-Moderator:
build: false
inheritance:
- Default
- Moderator
- Jr-Moderator
prefix: '&6[SR-MODERATOR]&6'
suffix: '&7'
permissions:
- essentials.repair
- essentials.heal
- essentials.item
- essentials.give
- essentials.fly
- essentials.kick
- essentials.mute
- essentials.tjail
- essentials.jail
- essentials.tempban
- essentials.vanish
Head-Moderator:
build: false
inheritance:
- Default
- Moderator
- Jr-Moderator
- Sr-Moderator
prefix: '&b[Moderator]&7'
suffix: '&7'
permissions:
- essentials.repair
- essentials.heal
- essentials.item
- essentials.give
- essentials.fly
- essentials.kick
- essentials.mute
- essentials.tjail
- essentials.jail
- essentials.tempban
- essentials.vanish
Jr-Admin:
build: true
inheritance:
- Moderator
- Jr-Moderator
- Sr-Moderator
- Default
- Donor
prefix: '&4[&cAdmin&4]&e'
suffix: '&7'
permissions:
- essentials.gamemode
- essentials.ban
- essentials.unban
- essentials.ipban
- essentials.unipban
- essentials.pardon
- essentials.enchant
Admin:
build: true
inheritance:
- Moderator
- Jr-Admin
- Jr-Moderator
- Sr-Moderator
- Head-Moderator
- Default
- Donor
prefix: '&4[&cAdmin&4]&e'
suffix: '&7'
permissions:
- essentials.gamemode
- essentials.ban
- essentials.unban
- essentials.ipban
- essentials.unipban
- essentials.pardon
- essentials.enchant
Sr-Admin:
build: true
inheritance:
- Moderator
- Admin
- Jr-Admin
- Head-Moderator
- Default
- Jr-Moderator
- Default
- Donor
- Sr-Moderator
prefix: '&4[&cAdmin&4]&e'
suffix: '&7'
permissions:
- essentials.gamemode
- essentials.ban
- essentials.unban
- essentials.ipban
- essentials.unipban
- essentials.pardon
- essentials.enchant
Head-Admin:
build: true
inheritance:
- Moderator
- Jr-Moderator
- Sr-Moderator
- Default
- Donor
- Jr-Admin
- Admin
- Sr-Admin
prefix: '&4[&cAdmin&4]&e'
suffix: '&7'
permissions:
- essentials.gamemode
- essentials.ban
- essentials.unban
- essentials.ipban
- essentials.unipban
- essentials.pardon
- essentials.enchant
Owner:
build:true
inheritance:
- Admin
prefix: '&4[Owner]'
suffix: '&b'
permissions:
- '*'
schema-version: 1
users:
0802e96f-707a-4302-b02f-1464a1801bef:
options:
prefix: '&5[MAIN-OWNER]&c'
name: DatSuperAdmin
suffix: '&4[CIVIL_PROTECTION_CAPTAIN]'
permissions:
- '*'
a4bb3d59-5964-446b-ac61-e8b2eba4d83d:
options:
prefix: '&5[OVERSEER]&c'
name: Unidentifieqd
permissions: []
worlds:
COMMUNICATIONS]&5:
options:
prefix: '&5[SEEGSON'
COMMUNICATIONS]:
options:
suffix: '&5[SEEGSON'
6a0f6daf-bea5-4738-abf1-e8c2f411d624:
options:
prefix: '&cADMIN]&c'
name: xXNicky227Xx
permissions: []
9ad43d8c-fa8a-40f4-90a2-c205463c2f9d:
options:
prefix: '&c[HEAD-ADMIN]&c'
name: RealTomasGamerLT
permissions: []
c22cf004-c559-4143-9de5-ca7413eaed35:
options:
name: Awesomeguy1909
9ddb8158-dc8e-4d21-87a9-e7371dcaadbf:
options:
prefix: cunt
name: Ace_Of_NUKE
permissions: []
84ccc713-d299-4b2c-aebc-f10410468125:
options:
prefix: '&c[HEAD-ADMIN]&c'
name: Orbman
permissions: []
fda411d4-1569-4482-b979-2d8388a02596:
permissions:
- '*'
options:
name: american21654
b042523d-4dc9-4067-a2fc-cde76e051f49:
options:
prefix: '&c[SR.ADMIN]&c'
name: stampysmith
b1849e59-3a39-45c7-b813-d0ae0992dde9:
options:
prefix: '&5[CO-OWNER]&6'
name: Prototype039
32bc435f-5633-49ab-808d-b4741fc35486:
options:
prefix: '&5[CO-OWNER]&c'
name: JustinWdn11
permissions:
- '*'
d8b49e64-5ab5-420b-a80b-bfb2dd083607:
permissions: []
options:
name: Kong_Carla
prefix: '&5[JR.CO-OWNER]'
d6b2927a-a724-424c-8dbd-53b5a3c38390:
group:
- admin
options:
name: TwoMinutesYT
prefix: '&c[ADMIN]'

Any help would greatly be appreciated!