suport request [SEVERE] Unexpected exception java.lang.NullPointerException

[INFO] ModLoader Server 1.1 Initializing...
[INFO] Mod Loaded: mod_BuildCraftCore 2.2.12
[INFO] Mod Loaded: mod_BuildCraftBuilders 2.2.12
[INFO] Mod Loaded: mod_BuildCraftEnergy 2.2.12
[INFO] Mod Loaded: mod_BuildCraftFactory 2.2.12
[INFO] Mod Loaded: mod_BuildCraftTransport 2.2.12
[INFO] Mod Loaded: mod_IC2 v1.62
[INFO] ModLoaderMP 1.1 Initialized
[INFO] Starting minecraft server version 1.1
[WARNING] **** NOT ENOUGH RAM!
[WARNING] To start the server with more ram, launch it as "java -Xmx1024M -Xms1024M -jar minecraft_server.jar"
[INFO] Loading properties
[INFO] Starting Minecraft server on *:25565
[WARNING] **** SERVER IS RUNNING IN OFFLINE/INSECURE MODE!
[WARNING] The server will make no attempt to authenticate usernames. Beware.
[WARNING] While this makes the game possible to play without internet access, it also opens up the ability for hackers to connect with any username they choose.
[WARNING] To change this, set "online-mode" to "true" in the server.settings file.
[INFO] Preparing level "PC-Gaming1"
[INFO] Default game type: 0
[INFO] Preparing start region for level 0
[INFO] Preparing spawn area: 4%
[INFO] Preparing spawn area: 12%
[SEVERE] Unexpected exception
java.lang.NullPointerException
at ic2.common.WorldGenRubTree.grow(WorldGenRubTree.java:60)
at ic2.common.WorldGenRubTree.a(WorldGenRubTree.java:32)
at mod_IC2.GenerateSurface(mod_IC2.java:1249)
at ModLoader.PopulateChunk(ModLoader.java:796)
at li.a(ChunkProviderServer.java:178)
at lq.a(Chunk.java:859)
at li.c(ChunkProviderServer.java:89)
at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:256)
at net.minecraft.server.MinecraftServer.s(MinecraftServer.java:175)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:315)
at cz.run(SourceFile:465)