[18:52:00] [Server thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.util.NoSuchElementException
	at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_151]
	at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_151]
	at h.a(SourceFile:124) [17w47b.jar:?]
	at net.minecraft.server.MinecraftServer.w(SourceFile:628) [17w47b.jar:?]
	at net.minecraft.server.MinecraftServer.v(SourceFile:584) [17w47b.jar:?]
	at ckv.v(SourceFile:152) [17w47b.jar:?]
	at net.minecraft.server.MinecraftServer.run(SourceFile:489) [17w47b.jar:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_151]
Caused by: java.util.NoSuchElementException
	at com.google.common.collect.Iterators$11.next(Iterators.java:1037) ~[guava-21.0.jar:?]
	at com.google.common.collect.Iterators.getLast(Iterators.java:829) ~[guava-21.0.jar:?]
	at h.b(SourceFile:167) ~[17w47b.jar:?]
	at aky.a(SourceFile:87) ~[17w47b.jar:?]
	at aky.a(SourceFile:74) ~[17w47b.jar:?]
	at aky.a(SourceFile:31) ~[17w47b.jar:?]
	at qo.b(SourceFile:200) ~[17w47b.jar:?]
	at qo.a(SourceFile:118) ~[17w47b.jar:?]
	at qx.a(SourceFile:644) ~[17w47b.jar:?]
	at ky.a(SourceFile:40) ~[17w47b.jar:?]
	at ky.a(SourceFile:10) ~[17w47b.jar:?]
	at hc$1.run(SourceFile:13) ~[17w47b.jar:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_151]
	at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_151]
	at h.a(SourceFile:123) ~[17w47b.jar:?]
	... 5 more