error from consol

[17:02:30] [Server thread/FATAL]: Error executing task on Server
java.lang.IllegalStateException: POI never registered at eu{x=1102, y=76, z=-683}
at aoz.a(SourceFile:72) ~[server.jar:?]
at aox.a(SourceFile:36) ~[server.jar:?]
at vc.c(SourceFile:1274) ~[server.jar:?]
at re.run(SourceFile:18) ~[server.jar:?]
at afy.g(SourceFile:122) [server.jar:?]
at agc.g(SourceFile:23) [server.jar:?]
at afy.p(SourceFile:101) [server.jar:?]
at net.minecraft.server.MinecraftServer.p(SourceFile:691) [server.jar:?]
at afy.bf(SourceFile:86) [server.jar:?]
at net.minecraft.server.MinecraftServer.o(SourceFile:675) [server.jar:?]
at net.minecraft.server.MinecraftServer.run(SourceFile:630) [server.jar:?]
at java.lang.Thread.run(Thread.java:834) [?:?]