Multiverse-Core not starting up

[stvncao5]

A few days ago, my server ran just fine, but one day, Multiverse-Core spontaneously stopped working and came up with this error...

[SEVERE] Error occurred while enabling Multiverse-Core v2.5-b641 (Is it up to date?)
java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Unknown Source)
at java.lang.AbstractStringBuilder.expandCapacity(Unknown Source)
at java.lang.AbstractStringBuilder.ensureCapacityInternal(Unknown Source)
at java.lang.AbstractStringBuilder.append(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at sun.net.www.protocol.jar.Handler.parseContextSpec(Unknown Source)
at sun.net.www.protocol.jar.Handler.parseURL(Unknown Source)
at java.net.URL.(Unknown Source)
at java.net.URL.(Unknown Source)
at sun.misc.URLClassPath$JarLoader.checkResource(Unknown Source)
at sun.misc.URLClassPath$JarLoader.getResource(Unknown Source)
at sun.misc.URLClassPath.getResource(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at net.minecraft.server.v1_4_R1.CrashReport.(CrashReport.java:21)
at net.minecraft.server.v1_4_R1.CrashReport.a(CrashReport.java:214)
at net.minecraft.server.v1_4_R1.Entity.d(Entity.java:1105)
at net.minecraft.server.v1_4_R1.Entity.c(Entity.java:1065)
at net.minecraft.server.v1_4_R1.ChunkRegionLoader.a(ChunkRegionLoader.java:241)
at net.minecraft.server.v1_4_R1.ChunkRegionLoader.a(ChunkRegionLoader.java:126)
at net.minecraft.server.v1_4_R1.ChunkProviderServer.saveChunk(ChunkProviderServer.java:208)
at org.bukkit.craftbukkit.v1_4_R1.CraftWorld.unloadChunk(CraftWorld.java:183)
at org.bukkit.craftbukkit.v1_4_R1.CraftWorld.unloadChunk(CraftWorld.java:153)
at org.bukkit.craftbukkit.v1_4_R1.CraftWorld.unloadChunk(CraftWorld.java:149)
at org.bukkit.craftbukkit.v1_4_R1.CraftWorld.setKeepSpawnInMemory(CraftWorld.java:1060)
at com.onarandombox.MultiverseCore.MVWorld$3.set(MVWorld.java:133)
at com.onarandombox.MultiverseCore.MVWorld$3.set(MVWorld.java:128)

It would come up with the same error every time I started up the server ever since then. I don't know any Java, so I honestly don't know what to make of this; I was hoping anyone who would read this ticket could redirect me to the problem if it's a (obvious) problem at my side. And if it is, sorry for wasting your time.

When it stopped working, I didn't make any significant changes to the server that would cause Multiverse to crash like this (not to the extent of my belief, at least). I'm using CraftBukkit 1.4.7 R1.0, and Multiverse-Core v2.5-b641.

Also, this is a little irrelevant, but does the "OutOfMemoryError: Java heap space" mean that I'm not allocating enough memory to Java?

[stvncao5]

The issue seems to have spontaneously stopped, and I suspect something else to be causing this. Sorry for wasting your time.