My server keeps crashing. It is non 24 hour, and I am running on a Mac. I will start it up, and a few minutes after startup it spontaneously crashes! (It is a Bukkit server with Multiverse)

Here is the report:

---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 11/29/15 3:27 PM
Description: Watching Server

java.lang.Error
at java.util.ArrayList.size(ArrayList.java:177)
at java.util.AbstractList$Itr.hasNext(AbstractList.java:339)
at net.minecraft.server.v1_8_R3.Entity.move(Entity.java:472)
at net.minecraft.server.v1_8_R3.EntityMinecartAbstract.a(EntityMinecartAbstract.java:504)
at net.minecraft.server.v1_8_R3.EntityMinecartAbstract.t_(EntityMinecartAbstract.java:284)
at net.minecraft.server.v1_8_R3.World.entityJoinedWorld(World.java:1420)
at net.minecraft.server.v1_8_R3.World.g(World.java:1398)
at net.minecraft.server.v1_8_R3.World.tickEntities(World.java:1269)
at net.minecraft.server.v1_8_R3.WorldServer.tickEntities(WorldServer.java:560)
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:727)
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:335)
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:629)
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:537)
at java.lang.Thread.run(Thread.java:695)


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

-- Head --
Stacktrace:
at java.util.ArrayList.size(ArrayList.java:177)
at java.util.AbstractList$Itr.hasNext(AbstractList.java:339)
at net.minecraft.server.v1_8_R3.Entity.move(Entity.java:472)
at net.minecraft.server.v1_8_R3.EntityMinecartAbstract.a(EntityMinecartAbstract.java:504)
at net.minecraft.server.v1_8_R3.EntityMinecartAbstract.t_(EntityMinecartAbstract.java:284)
at net.minecraft.server.v1_8_R3.World.entityJoinedWorld(World.java:1420)
at net.minecraft.server.v1_8_R3.World.g(World.java:1398)
at net.minecraft.server.v1_8_R3.World.tickEntities(World.java:1269)
at net.minecraft.server.v1_8_R3.WorldServer.tickEntities(WorldServer.java:560)
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:727)
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:335)
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:629)

-- Thread Dump --
Details:
Threads: "File IO Thread" Id=93 TIMED_WAITING
at java.lang.Thread.sleep(Native Method)
at net.minecraft.server.v1_8_R3.FileIOThread.c(SourceFile:51)
at net.minecraft.server.v1_8_R3.FileIOThread.run(SourceFile:30)
at java.lang.Thread.run(Thread.java:695)


"Netty Server IO #3" Id=43 RUNNABLE
at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method)
at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:136)
at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:69)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked io.netty.channel.nio.SelectedSelectionKeySet@12ca71eb
- locked java.util.Collections$UnmodifiableSet@7b4f3d95
- locked sun.nio.ch.KQueueSelectorImpl@6453043a
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
...


"Netty Server IO #2" Id=42 RUNNABLE
at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method)
at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:136)
at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:69)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked io.netty.channel.nio.SelectedSelectionKeySet@76ca681e
- locked java.util.Collections$UnmodifiableSet@28d6ee5b
- locked sun.nio.ch.KQueueSelectorImpl@19c8399b
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
...


"Chunk I/O Executor Thread-1" Id=86 WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@283dfc56
at sun.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@283dfc56
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1987)
at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:399)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:957)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:917)
at java.lang.Thread.run(Thread.java:695)


"Netty Server IO #1" Id=41 RUNNABLE
at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method)
at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:136)
at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:69)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked io.netty.channel.nio.SelectedSelectionKeySet@42b522aa
- locked java.util.Collections$UnmodifiableSet@79426fec
- locked sun.nio.ch.KQueueSelectorImpl@14221613
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
...


"Server Watchdog" Id=77 RUNNABLE
at sun.management.ThreadImpl.dumpThreads0(Native Method)
at sun.management.ThreadImpl.dumpAllThreads(ThreadImpl.java:433)
at net.minecraft.server.v1_8_R3.ThreadWatchdog.run(SourceFile:43)
at java.lang.Thread.run(Thread.java:695)


"Thread-15" Id=57 TIMED_WAITING
at java.lang.Thread.sleep(Native Method)
at nz.co.lolnet.james137137.ChunkLoader.ThreadKeepChunksLoaded.run(ThreadKeepChunksLoaded.java:46)
at java.lang.Thread.run(Thread.java:695)


"Netty Server IO #0" Id=40 RUNNABLE
at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method)
at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:136)
at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:69)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked io.netty.channel.nio.SelectedSelectionKeySet@539f0ae7
- locked java.util.Collections$UnmodifiableSet@594b6f3b
- locked sun.nio.ch.KQueueSelectorImpl@5e47f5ae
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
...


"Server console handler" Id=35 RUNNABLE (in native)
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:220)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
- locked java.io.BufferedInputStream@4652a2dd
at org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream.read(NonBlockingInputStream.java:169)
- locked org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream@5b427f3c
at org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream.read(NonBlockingInputStream.java:137)
at org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream.read(NonBlockingInputStream.java:246)
at org.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:261)
- locked org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream@5b427f3c
...


"Thread-12" Id=36 RUNNABLE
at java.lang.String.length(String.java:651)
at java.util.regex.Matcher.getTextLength(Matcher.java:1140)
at java.util.regex.Matcher.reset(Matcher.java:291)
at java.util.regex.Matcher.<init>(Matcher.java:211)
at java.util.regex.Pattern.matcher(Pattern.java:888)
at org.bukkit.craftbukkit.libs.jline.internal.TerminalLineSettings.getProperty(TerminalLineSettings.java:131)
at org.bukkit.craftbukkit.libs.jline.internal.TerminalLineSettings.getProperty(TerminalLineSettings.java:112)
at org.bukkit.craftbukkit.libs.jline.UnixTerminal.getWidth(UnixTerminal.java:76)
...


"DestroyJavaVM" Id=34 RUNNABLE


"Server thread" Id=32 RUNNABLE
at java.util.ArrayList.size(ArrayList.java:177)
at java.util.AbstractList$Itr.hasNext(AbstractList.java:339)
at net.minecraft.server.v1_8_R3.Entity.move(Entity.java:472)
at net.minecraft.server.v1_8_R3.EntityMinecartAbstract.a(EntityMinecartAbstract.java:504)
at net.minecraft.server.v1_8_R3.EntityMinecartAbstract.t_(EntityMinecartAbstract.java:284)
at net.minecraft.server.v1_8_R3.World.entityJoinedWorld(World.java:1420)
at net.minecraft.server.v1_8_R3.World.g(World.java:1398)
at net.minecraft.server.v1_8_R3.World.tickEntities(World.java:1269)
...


"Server Infinisleeper" Id=33 TIMED_WAITING
at java.lang.Thread.sleep(Native Method)
at net.minecraft.server.v1_8_R3.DedicatedServer$1.run(DedicatedServer.java:53)


"NonBlockingInputStreamThread" Id=30 WAITING on org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream@5b427f3c owned by "Server console handler" Id=35
at java.lang.Object.wait(Native Method)
- waiting on org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream@5b427f3c
at org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream.run(NonBlockingInputStream.java:278)
at java.lang.Thread.run(Thread.java:695)


"Snooper Timer" Id=23 TIMED_WAITING on java.util.TaskQueue@6aaf6af2
at java.lang.Object.wait(Native Method)
- waiting on java.util.TaskQueue@6aaf6af2
at java.util.TimerThread.mainLoop(Timer.java:509)
at java.util.TimerThread.run(Timer.java:462)


"AWT-AppKit" Id=12 RUNNABLE (in native)


"Signal Dispatcher" Id=6 RUNNABLE


"Finalizer" Id=3 WAITING on java.lang.ref.ReferenceQueue$Lock@22966c96
at java.lang.Object.wait(Native Method)
- waiting on java.lang.ref.ReferenceQueue$Lock@22966c96
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:171)


"Reference Handler" Id=2 WAITING on java.lang.ref.Reference$Lock@41b2fd97
at java.lang.Object.wait(Native Method)
- waiting on java.lang.ref.Reference$Lock@41b2fd97
at java.lang.Object.wait(Object.java:485)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)



Stacktrace:
at net.minecraft.server.v1_8_R3.ThreadWatchdog.run(SourceFile:59)
at java.lang.Thread.run(Thread.java:695)

-- System Details --
Details:
Minecraft Version: 1.8.8
Operating System: Mac OS X (x86_64) version 10.10.5
Java Version: 1.6.0_65, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 398291648 bytes (379 MB) / 1478549504 bytes (1410 MB) up to 73391603712 bytes (69991 MB)
JVM Flags: 1 total; -Xmx70000M
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
CraftBukkit Information:
Running: CraftBukkit version git-Bukkit-62a2169 (MC: 1.8.8) (Implementing API version 1.8.8-R0.1-SNAPSHOT) true
Plugins: { ChunkLoader v1.8.0 nz.co.lolnet.james137137.ChunkLoader.ChunkLoader [James Anderson], Multiverse-Core v2.5-b691 com.onarandombox.MultiverseCore.MultiverseCore [Rigby, fernferret, lithium3141, main--],}
Warnings: DEFAULT
Reload Count: 0
Threads: { RUNNABLE Server console handler: [java.io.FileInputStream.readBytes(Native Method), java.io.FileInputStream.read(FileInputStream.java:220), java.io.BufferedInputStream.fill(BufferedInputStream.java:218), java.io.BufferedInputStream.read(BufferedInputStream.java:237), org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream.read(NonBlockingInputStream.java:169), org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream.read(NonBlockingInputStream.java:137), org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream.read(NonBlockingInputStream.java:246), org.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:261), org.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:198), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readCharacter(ConsoleReader.java:2145), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readLine(ConsoleReader.java:2349), net.minecraft.server.v1_8_R3.DedicatedServer$2.run(DedicatedServer.java:78)], RUNNABLE Netty Server IO #2: [sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method), sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:136), sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:69), sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69), sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80), io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622), io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310), io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116), java.lang.Thread.run(Thread.java:695)], RUNNABLE Netty Server IO #1: [sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method), sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:136), sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:69), sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69), sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80), io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622), io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310), io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116), java.lang.Thread.run(Thread.java:695)], WAITING Reference Handler: [java.lang.Object.wait(Native Method), java.lang.Object.wait(Object.java:485), java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)], RUNNABLE Server Watchdog: [java.lang.Thread.dumpThreads(Native Method), java.lang.Thread.getAllStackTraces(Thread.java:1569), org.bukkit.craftbukkit.v1_8_R3.CraftCrashReport.call(CraftCrashReport.java:29), net.minecraft.server.v1_8_R3.CrashReportSystemDetails.a(SourceFile:78), net.minecraft.server.v1_8_R3.CrashReport.h(CrashReport.java:127), net.minecraft.server.v1_8_R3.CrashReport.<init>(CrashReport.java:34), net.minecraft.server.v1_8_R3.ThreadWatchdog.run(SourceFile:57), java.lang.Thread.run(Thread.java:695)], TIMED_WAITING File IO Thread: [java.lang.Thread.sleep(Native Method), net.minecraft.server.v1_8_R3.FileIOThread.c(SourceFile:51), net.minecraft.server.v1_8_R3.FileIOThread.run(SourceFile:30), java.lang.Thread.run(Thread.java:695)], RUNNABLE Server thread: [java.util.ArrayList.size(ArrayList.java:177), java.util.AbstractList$Itr.hasNext(AbstractList.java:339), net.minecraft.server.v1_8_R3.Entity.move(Entity.java:482), net.minecraft.server.v1_8_R3.EntityMinecartAbstract.a(EntityMinecartAbstract.java:504), net.minecraft.server.v1_8_R3.EntityMinecartAbstract.t_(EntityMinecartAbstract.java:284), net.minecraft.server.v1_8_R3.World.entityJoinedWorld(World.java:1420), net.minecraft.server.v1_8_R3.World.g(World.java:1398), net.minecraft.server.v1_8_R3.World.tickEntities(World.java:1269), net.minecraft.server.v1_8_R3.WorldServer.tickEntities(WorldServer.java:560), net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:727), net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:335), net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:629), net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:537), java.lang.Thread.run(Thread.java:695)], WAITING Thread-12: [sun.misc.Unsafe.park(Native Method), java.util.concurrent.locks.LockSupport.park(LockSupport.java:156), java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1987), java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:399), com.mojang.util.QueueLogAppender.getNextLogEvent(QueueLogAppender.java:77), org.bukkit.craftbukkit.v1_8_R3.util.TerminalConsoleWriterThread.run(TerminalConsoleWriterThread.java:25), java.lang.Thread.run(Thread.java:695)], WAITING Chunk I/O Executor Thread-1: [sun.misc.Unsafe.park(Native Method), java.util.concurrent.locks.LockSupport.park(LockSupport.java:156), java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1987), java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:399), java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:957), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:917), java.lang.Thread.run(Thread.java:695)], WAITING Finalizer: [java.lang.Object.wait(Native Method), java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118), java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134), java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:171)], TIMED_WAITING Server Infinisleeper: [java.lang.Thread.sleep(Native Method), net.minecraft.server.v1_8_R3.DedicatedServer$1.run(DedicatedServer.java:53)], WAITING NonBlockingInputStreamThread: [java.lang.Object.wait(Native Method), org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream.run(NonBlockingInputStream.java:278), java.lang.Thread.run(Thread.java:695)], RUNNABLE Netty Server IO #3: [sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method), sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:136), sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:69), sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69), sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80), io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622), io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310), io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116), java.lang.Thread.run(Thread.java:695)], TIMED_WAITING Snooper Timer: [java.lang.Object.wait(Native Method), java.util.TimerThread.mainLoop(Timer.java:509), java.util.TimerThread.run(Timer.java:462)], RUNNABLE AWT-AppKit: [], RUNNABLE Netty Server IO #0: [sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method), sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:136), sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:69), sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69), sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80), io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622), io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310), io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116), java.lang.Thread.run(Thread.java:695)], RUNNABLE Signal Dispatcher: [], TIMED_WAITING Thread-15: [java.lang.Thread.sleep(Native Method), nz.co.lolnet.james137137.ChunkLoader.ThreadKeepChunksLoaded.run(ThreadKeepChunksLoaded.java:46), java.lang.Thread.run(Thread.java:695)], RUNNABLE DestroyJavaVM: [],}
Recent tasks from 337-367{Multiverse-Core:org.mcstats.multiverse.Metrics$1@31,}
Profiler Position: N/A (disabled)
Player Count: 1 / 20; [EntityPlayer['UltraWesley123'/623, l='House', x=-116.95, y=57.03, z=-93.43](UltraWesley123 at -116.95439001237324,57.02887213482261,-93.43494784699578)]
Is Modded: Definitely; Server brand changed to 'CraftBukkit'
Type: Dedicated Server (map_server.txt)


Please help!