Data tag parsing failed: Syntax error

hi,
what is the problem ?
thanks

many errors :
2017-10-22 [09:45:38] [Server thread/INFO]: Data tag parsing failed: Syntax error: unexpected 's' at offset 0
2017-10-22 [13:47:59] [Server thread/INFO]: Data tag parsing failed: Syntax error: unexpected '6' at offset 0


PocketMine-MP 1.7dev-309:
Linux
PHP 7.2.0 RC4

Slapper 1.3.7; iProtector 3.1.0-3; ChatToDiscord 1.1.0; VoteReward 3.0.2-3; essentialsTP 1.2.0-2; AllSigns 1.0.4; PiggyCustomEnchants 1.0.2-2; xyz 1.0.4; AlwaysSpawn 2.2.3-3; PurePerms 1.4.1-2; ItemCasePE 1.2.1; EconomyAPI 5.7.1-3; Parkour 1.5.6-3; BanItem 2.3.2-2.alpha8; EconomyShop 2.0.8-5; FactionsPro 1.4.5-5; PureChat 1.4.10-3