I'm getting this error

Hello all I recently came from making and owning wow servers and I won't to expand my server with a mincraft server only problem I have this problem when I try and start up my minecraft server.

Code:

2012-10-07 18:42:39 [SEVERE] java.lang.OutOfMemoryError: Java heap space
2012-10-07 18:42:39 [SEVERE]    at net.minecraft.server.NibbleArray.<init>(SourceFile:9)
2012-10-07 18:42:39 [SEVERE]    at net.minecraft.server.ChunkSection.<init>(ChunkSection.java:17)
2012-10-07 18:42:39 [SEVERE]    at net.minecraft.server.Chunk.<init>(Chunk.java:89)
2012-10-07 18:42:40 [SEVERE]    at net.minecraft.server.ChunkProviderHell.getOrCreateChunk(SourceFile:201)
2012-10-07 18:42:40 [SEVERE]    at org.bukkit.craftbukkit.generator.NormalChunkGenerator.getOrCreateChunk(NormalChunkGenerator.java:41)
2012-10-07 18:42:40 [SEVERE]    at net.minecraft.server.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:95)
2012-10-07 18:42:40 [SEVERE]    at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:261)
2012-10-07 18:42:40 [SEVERE]    at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:226)
2012-10-07 18:42:40 [SEVERE]    at net.minecraft.server.DedicatedServer.init(DedicatedServer.java:140)
2012-10-07 18:42:40 [SEVERE]    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:377)
2012-10-07 18:42:40 [SEVERE]    at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
2012-10-07 18:42:41 [SEVERE] Encountered an unexpected exception OutOfMemoryError
java.lang.OutOfMemoryError: Java heap space
    at net.minecraft.server.NibbleArray.<init>(SourceFile:9)
    at net.minecraft.server.ChunkSection.<init>(ChunkSection.java:17)
    at net.minecraft.server.Chunk.<init>(Chunk.java:89)
    at net.minecraft.server.ChunkProviderHell.getOrCreateChunk(SourceFile:201)
    at org.bukkit.craftbukkit.generator.NormalChunkGenerator.getOrCreateChunk(NormalChunkGenerator.java:41)
    at net.minecraft.server.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:95)
    at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:261)
    at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:226)
    at net.minecraft.server.DedicatedServer.init(DedicatedServer.java:140)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:377)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
2012-10-07 18:42:59 [SEVERE] Could not save crash report to .\crash-reports\crash-2012-10-07_18.42.57-server.txt
java.lang.OutOfMemoryError: Java heap space
    at java.util.Arrays.copyOf(Unknown Source)
    at java.lang.AbstractStringBuilder.expandCapacity(Unknown Source)
    at java.lang.AbstractStringBuilder.append(Unknown Source)
    at java.lang.StringBuilder.append(Unknown Source)
    at net.minecraft.server.CrashReport.a(CrashReport.java:78)
    at net.minecraft.server.CrashReport.e(CrashReport.java:126)
    at net.minecraft.server.CrashReport.a(CrashReport.java:141)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
2012-10-07 18:43:00 [SEVERE] We were unable to save this crash report to disk.

If anyone could help would appreciate it thanks.

 

reports you didnt give enough RAM to the server to even start it self up. how much RAM you have/giving it?

 

I have 4 gb ram. how do I assign ram to the server?

 

What is your launch command? There is a -Xmx setting to set max RAM, like -Xmx2048M