Couldn't look up profile properties for com.mojang.authlib.GameProfile

Suddenly appeared in the console. How to fix?

forge-1.8.9-11.15.1.1890-1.8.9-universal.jar
spongeforge-1.8.9-1890-4.2.0-BETA-1662.jar

What are your plugins?

ColorConsole.jar
CommandScheduler-2.3.jar
CommandSigns-API-4.2.0-1.3.jar
EconomyLite-4.0.0-v2.2.5.jar
EnchantBox-0.0.2.jar
EssentialCmds-1.8.9-8.1.14-universal-ru.jar
FlexibleLogin.jar
FoxCore-0.9.2-124-server.jar
FoxGuard-0.19.1-dev-275.jar
Graveyards_v2.0.1.jar
HealthName.jar
holograms-v1.0.1.jar
JobsLite-4.0.0-1.6.1.jar
Kits-1.7.4.jar
MightyLoot-1.2-rus.jar
pex-api4.jar
spongeforge-1.8.9-1890-4.2.0-BETA-1662.jar
StarAPI-0.0.58.jar
TimTheEnchanter.jar
treepers-1.2.jar
Updatifier-v1.4.0-r4.1.0.jar
worldedit-sponge-mc1.8.9-6.1.4-SNAPSHOT-dist.jar
XtraPunish-2.0.jar

It happens even without plugins! With the exception of the sponge.

Had you been doing much on the server when this happened, or did it seem to occur all on its own?

This happens after starting the server. Without any works.

I never solved this problem! Help!

spongeforge-1.10.2-2052-5.0.0-BETA-1675.jar
spongeforge-1.8.9-1890-4.2.0-BETA-1666.jar

Could you upload a zip file containing your server directory?