Error : /plugins/Jail/players.yml: Cannot serialize Server instance

[teracube]

Hi,

Error on the console :

2017-09-15 [20:04:33] �[Server thread/CRITICAL]: Could not save Config /home/gsp_1582/g7.hmserv.eu-19132/plugins/Jail/players.yml: Cannot serialize Server instance�

---

PocketMine-MP 1.6.2dev-578: PurePerms 1.4.1-dev2; AllSigns 1.0.3; ItemCasePE 1.1.0-dev1; FactionsPro 1.3.11-2.alpha7; KillMoney 1.1.2; xyz 1.0.3; EconomyAPI 5.7.1-dev2; SimpleAuth 2.1.0-map.3; essentialsTP 1.2.0-dev1; CrateKeys 1.0.0; SimpleAuthHelper 2.0.6; AlwaysSpawn 2.2.3-dev1; Jail 1.2.0; PiggyCustomEnchants 1.0.2; Slapper 1.3.5; ChatToDiscord 1.1.0; iProtector 4.0.1#3.1b; Parkour 1.5.6; EconomyShop 2.0.8-dev2; PureChat 1.4.10-dev2