---- Minecraft Crash Report ----
// You're mean.

Time: 12/2/15 8:29 AM
Description: Exception while updating neighbours

java.util.ConcurrentModificationException
	at java.util.WeakHashMap$HashIterator.nextEntry(WeakHashMap.java:882)
	at java.util.WeakHashMap$KeyIterator.next(WeakHashMap.java:915)
	at vc.a(SourceFile:25)
	at ahn.a(SourceFile:373)
	at ahn.a(SourceFile:319)
	at anp.a(SourceFile:227)
	at anp.e(SourceFile:167)
	at anp.a(SourceFile:322)
	at ahn.e(SourceFile:444)
	at akk.h(SourceFile:211)
	at anu.b(SourceFile:130)
	at arw.a(SourceFile:441)
	at ahn.a(SourceFile:309)
	at akk.b(SourceFile:72)
	at lp.a(SourceFile:646)
	at lp.d(SourceFile:215)
	at net.minecraft.server.MinecraftServer.D(SourceFile:617)
	at la.D(SourceFile:339)
	at net.minecraft.server.MinecraftServer.C(SourceFile:553)
	at net.minecraft.server.MinecraftServer.run(SourceFile:457)
	at java.lang.Thread.run(Thread.java:744)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at java.util.WeakHashMap$HashIterator.nextEntry(WeakHashMap.java:882)
	at java.util.WeakHashMap$KeyIterator.next(WeakHashMap.java:915)
	at vc.a(SourceFile:25)
	at ahn.a(SourceFile:373)
	at ahn.a(SourceFile:319)
	at anp.a(SourceFile:227)
	at anp.e(SourceFile:167)
	at anp.a(SourceFile:322)

-- Block being updated --
Details:
	Source block type: ID #93 (tile.diode // anu)
	Block: minecraft:redstone_wire[east=none,north=none,power=0,south=none,west=none]
	Block location: World: (490,66,319), Chunk: (at 10,4,15 in 30,19; contains blocks 480,0,304 to 495,255,319), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Stacktrace:
	at ahn.e(SourceFile:444)
	at akk.h(SourceFile:211)
	at anu.b(SourceFile:130)
	at arw.a(SourceFile:441)
	at ahn.a(SourceFile:309)
	at akk.b(SourceFile:72)

-- Block being ticked --
Details:
	Block: minecraft:unpowered_repeater[delay=3,facing=east,locked=false]
	Block location: World: (491,66,319), Chunk: (at 11,4,15 in 30,19; contains blocks 480,0,304 to 495,255,319), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Stacktrace:
	at lp.a(SourceFile:646)
	at lp.d(SourceFile:215)

-- Affected level --
Details:
	Level name: world
	All players: 1 total; [lr['suwensi'/945, l='world', x=554.73, y=64.00, z=315.55]]
	Chunk stats: ServerChunkCache: 745 Drop: 0
	Level seed: 3599673377888481317
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (544,70,368), Chunk: (at 0,4,0 in 34,23; contains blocks 544,0,368 to 559,255,383), Region: (1,0; contains chunks 32,0 to 63,31, blocks 512,0,0 to 1023,255,511)
	Level time: 1097596412 game time, 3333345 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 2103 (now: false), thunder time: 74103 (now: false)
	Level game mode: Game mode: adventure (ID 2). Hardcore: false. Cheats: false
Stacktrace:
	at net.minecraft.server.MinecraftServer.D(SourceFile:617)
	at la.D(SourceFile:339)
	at net.minecraft.server.MinecraftServer.C(SourceFile:553)
	at net.minecraft.server.MinecraftServer.run(SourceFile:457)
	at java.lang.Thread.run(Thread.java:744)

-- System Details --
Details:
	Minecraft Version: 15w49a
	Operating System: Mac OS X (x86_64) version 10.11.1
	Java Version: 1.7.0_45, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 459664400 bytes (438 MB) / 1071644672 bytes (1022 MB) up to 1071644672 bytes (1022 MB)
	JVM Flags: 2 total; -Xmx1G -Xms1G
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
	Profiler Position: N/A (disabled)
	Player Count: 1 / 20; [lr['suwensi'/945, l='world', x=554.73, y=64.00, z=315.55]]
	Is Modded: Unknown (can't tell)
	Type: Dedicated Server (map_server.txt)