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I keep crashing on this server.

---- Minecraft Crash Report ----
// Why is it breaking 

Time: 6/1/16 1:21 PM
Description: Batching chunks

java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
	at java.util.ArrayList$Itr.next(ArrayList.java:851)
	at aht.a(SourceFile:1858)
	at asf.a(SourceFile:634)
	at aic.r(SourceFile:63)
	at bqc.b(SourceFile:160)
	at bpy.a(SourceFile:100)
	at bpy.run(SourceFile:43)
	at java.lang.Thread.run(Thread.java:745)


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

-- Head --
Thread: Client thread
Stacktrace:
	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
	at java.util.ArrayList$Itr.next(ArrayList.java:851)
	at aht.a(SourceFile:1858)
	at asf.a(SourceFile:634)
	at aic.r(SourceFile:63)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bmr['Sammyandsam'/7570, l='MpServer', x=14202.40, y=120.00, z=-4397.57]]
	Chunk stats: MultiplayerChunkCache: 81, 81
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (0,118,0), Chunk: (at 0,7,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 259701906 game time, 224651892 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
	Forced entities: 16 total; [bms['Magragh'/22628494, l='MpServer', x=-6992.72, y=122.03, z=-15232.66], wd['Hopper's'/22713503, l='MpServer', x=14218.06, y=120.00, z=-4394.94], yd['item.tile.cactus'/22604830, l='MpServer', x=-6988.44, y=120.00, z=-15197.13], bms['Magragh'/22628494, l='MpServer', x=-6992.72, y=122.03, z=-15232.66], bmr['Sammyandsam'/7570, l='MpServer', x=14202.40, y=120.00, z=-4397.57], bms['calpal424'/22542966, l='MpServer', x=-10585.96, y=181.36, z=827.32], bms['calpal424'/22542966, l='MpServer', x=-10582.09, y=181.00, z=837.13], bms['Magragh'/22628494, l='MpServer', x=-6992.72, y=122.03, z=-15232.66], wc['Pig'/22713522, l='MpServer', x=14207.81, y=120.00, z=-4407.66], bms['Magragh'/22628494, l='MpServer', x=-7001.10, y=132.91, z=-15199.92], rx['Experience Orb'/22713520, l='MpServer', x=14217.22, y=120.00, z=-4411.28], bms['Magragh'/22628494, l='MpServer', x=-7012.57, y=124.14, z=-15185.77], vx['Chicken'/22644267, l='MpServer', x=12597.78, y=121.00, z=15990.19], we['Sheep'/22713518, l='MpServer', x=14183.84, y=173.00, z=-4382.88], bms['calpal424'/22542966, l='MpServer', x=-10566.13, y=46.00, z=806.33], bms['Magragh'/22628494, l='MpServer', x=-6993.25, y=122.03, z=-15227.98]]
	Retry entities: 13 total; [yd['item.tile.cactus'/22604830, l='MpServer', x=-6988.44, y=120.00, z=-15197.13], wc['Pig'/22713522, l='MpServer', x=14207.81, y=120.00, z=-4407.66], yd['item.tile.cactus'/22672595, l='MpServer', x=-6983.92, y=120.00, z=-15201.13], yd['item.tile.cactus'/22681104, l='MpServer', x=12591.16, y=122.94, z=15995.88], rx['Experience Orb'/22713520, l='MpServer', x=14217.22, y=120.00, z=-4411.28], vx['Chicken'/22644267, l='MpServer', x=12597.78, y=121.00, z=15990.19], vx['Chicken'/22644266, l='MpServer', x=12597.19, y=121.00, z=15990.19], we['Sheep'/22713518, l='MpServer', x=14183.84, y=173.00, z=-4382.88], yd['item.tile.cactus'/22681103, l='MpServer', x=12589.81, y=123.94, z=15994.88], yd['item.tile.cactus'/22713007, l='MpServer', x=12587.25, y=119.41, z=15998.13], yd['item.tile.cactus'/22644261, l='MpServer', x=12591.69, y=118.00, z=15994.28], vx['Chicken'/22644263, l='MpServer', x=12597.19, y=121.00, z=15990.78], vx['Chicken'/22644262, l='MpServer', x=12597.19, y=121.00, z=15990.19]]
	Server brand: Waterfall (git:Waterfall-Bootstrap:1.9-SNAPSHOT:51594a1:211) <- TacoSpigot
	Server type: Non-integrated multiplayer server
Stacktrace:
	at bks.a(SourceFile:365)
	at bcd.b(SourceFile:2521)
	at bpy.run(SourceFile:49)
	at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
	Minecraft Version: 1.9.4
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_73, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 137809648 bytes (131 MB) / 261844992 bytes (249 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.9.4
	LWJGL: 2.9.4
	OpenGL: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	Using VBOs: No
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: 
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	CPU: [email protected]