Bonsoir,
Ce matin en lançant mon serveur, j'ai tout d'abord aperçu que sur minecraft, je n'avait pas mon group de Fondateur, ensuite en essayant de me le remettre, j'ai eu un message d'erreur dans le chat me disant d'aller consulter la console j'y suis donc aller et j'y ai vu ça (je suis sur SpiGot, version : git-spigot-f928e7a-e91aed8) :

13.08 15:33:56 [Server] INFO at org.anjocaido.groupmanager.GroupManager.onEnable(GroupManager.java:91) ~[?:?]
13.08 15:33:56 [Server] INFO at org.anjocaido.groupmanager.GroupManager.onEnable(GroupManager.java:236) ~[?:?]
13.08 15:33:56 [Server] INFO plugins/GroupManager/worlds/world/groups.yml 13.08 15:33:56 [Server] INFO java.lang.IllegalArgumentException: The following file couldn't pass on Parser.
13.08 15:33:56 [Server] ERROR Error occurred while enabling GroupManager v2.0 (Phoenix) (Is it up to date?)
13.08 15:33:56 [Server] WARN GroupManager - SEVERE - ===================================================
13.08 15:33:56 [Server] WARN GroupManager - SEVERE - = ERROR REPORT ENDED =
13.08 15:33:56 [Server] WARN GroupManager - SEVERE - ===================================================
13.08 15:33:56 [Server] INFO plugins/GroupManager/worlds/world/groups.yml
13.08 15:33:56 [Server] WARN GroupManager - SEVERE - The following file couldn't pass on Parser.
13.08 15:33:56 [Server] WARN GroupManager - SEVERE - ===================================================
13.08 15:33:56 [Server] WARN GroupManager - SEVERE - = GROUPMANAGER FOLDER TO AN ESSENTIALS DEVELOPER =
13.08 15:33:56 [Server] WARN GroupManager - SEVERE - === PLEASE COPY AND PASTE THE ERROR.LOG FROM THE ==
13.08 15:33:56 [Server] WARN GroupManager - SEVERE - ===================================================
13.08 15:33:56 [Server] WARN GroupManager - SEVERE - = ERROR REPORT START - 2.0 (Phoenix) =
13.08 15:33:56 [Server] WARN GroupManager - SEVERE - ===================================================
13.08 15:33:56 [Server] INFO Enabling GroupManager v2.0 (Phoenix)

Donc j'ai regarder le fichier concerné, j'ai un peu regardé et je n'ai pas trouvé l'erreur, je vous en mes une copie :

''# Group inheritance

#

1. Any inherited groups prefixed with a g: are global groups
2. and are inherited from the GlobalGroups.yml.

#

1. Groups without the g: prefix are groups local to this world
2. and are defined in the this groups.yml file.

#

1. Local group inheritances define your promotion tree when using 'manpromote/mandemote'

groups:
Owner:
default: false
permissions:
- vanish.*
- '*'
inheritance:
- admin
info:
prefix: '&4'
build: true
suffix:
Faucheur:
default: false
permissions: []
inheritance:
- Guerrier
info:
prefix: '&1[&6Faucheur&1]'
build: false
suffix:
Fondateur:
default: false
permissions:
- '*'
- moderator
- admin
- g:groupmanager_admin
- g:bukkit_admin
- g:essentials_admin
- g:towny_admin
- g:vanish_admin
inheritance: []
info:
prefix: '&3{&a&oFondateur&3}'
build: false
suffix:
Berserker:
default: false
permissions: []
inheritance:
- Guerrier
info:
prefix: '&6[&cBerserker&6]'
build: false
suffix:
Ninja:
default: false
permissions: []
inheritance:
- Guerrier
info:
prefix: '&a[&2Ninja&a]'
build: false
suffix:
Admin:
default: false
permissions: []
inheritance:
- moderator
- g:groupmanager_admin
- g:bukkit_admin
- g:essentials_admin
- g:towny_admin
- g:vanish_admin
info:
prefix: '&c'
build: true
suffix:
CoFonda:
default: false
permissions: []
inheritance:
- '*'
- moderator
- admin
- g:groupmanager_admin
- g:bukkit_admin
- g:essentials_admin
- g:towny_admin
- g:vanish_admin
info:
prefix: '&3{&a&oCo&4-&a&oFondateur&3}'
build: false
suffix:
Démon:
default: false
permissions: []
inheritance:
- Guerrier
info:
prefix: '&c[&5&lDémon&c]'
build: false
suffix:
Barbare:
default: false
permissions: []
inheritance:
- Guerrier
info:
prefix: '&8[&cBarbare&8]'
build: false
suffix:
Conquérant:
default: false
permissions: []
inheritance:
- Guerrier
info:
prefix: '&b[&9Conquérant&b]'
build: false
suffix:
Guerrier:
default: true
permissions:
- bukkit.command.kill
- essentials.afk
- essentials.back
- essentials.balance
- essentials.balancetop
- essentials.delhome
- essentials.home
- essentials.ignore
- essentials.kit
- essentials.kits.Guerrier
- essentials.msg
- essentials.pay
- essentials.sethome
- essentials.suicide
- essentials.tpa
- essentials.tpaccept
- essentials.tpahere
- essentials.tpdeny
inheritance: []
info:
prefix: '&7[&8Guerrier&7]'
build: false
suffix:
Builder:
default: false
permissions: []
inheritance:
- g:essentials_builder
- g:towny_builder
info:
prefix: '&2'
build: true
suffix:
Gladiateur:
default: false
permissions: []
inheritance:
- Guerrier
info:
prefix: '&e[&3&lGladiateur&e]'
build: false
suffix:
Moderator:
default: false
permissions: []
inheritance:
- builder
- g:groupmanager_moderator
- g:bukkit_moderator
- g:essentials_moderator
- g:towny_moderator
- g:vanish_moderator
info:
prefix: '&5'
build: true
suffix:
Assassin:
default: false
permissions: []
inheritance:
- Guerrier
info:
prefix: '&0[&6Assassin&0]&6'
build: false
suffix: ''''

Voilà, j'espere que vous pourrez me venir en aide, et je vous donne la liste des plugins sur mon serveur :

AlchemicalArrows, GroupManager, ClearLag, Multiverse-Core, WorldEdit, UberEnchant, AutoSaveWorld, Essentials, EssentialsChat, EssentialsProtect, EssentialsSpawn

Merci d'avoir lu,
Cordialement,
Wizar_li.

bon au final je me suis tourné vers permissionEx : plus simple, et ça a regler tous es soucis.