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I just added mo creatures and it was working fine for about an hour. My game crashed unexpectedly and now I can't play because it immediately goes to error screen when I load my saved world. What should I do about this and is my save file no longer playable? Minecraft is updated to 1.5.1 and all mods are up to date. This is the error report.


---- Minecraft Crash Report ----
// Shall we play a game?

Time: 5/1/13 3:14 PM
Description: Exception in server tick loop

java.lang.NoSuchMethodError: drzhark.customspawner.CustomSpawner.getCustomBiomeSpawnList(Lnet/minecraft/world/biome/BiomeGenBase;)Ljava/util/List;
at drzhark.mocreatures.MoCEventHooks.peformCustomWorldGenSpawning(MoCEventHooks.java:16)
at net.minecraftforge.event.ASMEventHandler_4_MoCEventHooks_peformCustomWorldGenSpawning_Populate.invoke(.dynamic)
at net.minecraftforge.event.ASMEventHandler.invoke(ASMEventHandler.java:35)
at net.minecraftforge.event.EventBus.post(EventBus.java:103)
at net.minecraftforge.event.terraingen.TerrainGen.populate(TerrainGen.java:36)
at net.minecraft.world.gen.ChunkProviderGenerate.func_73153_a(ChunkProviderGenerate.java:542)
at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:258)
at net.minecraft.world.chunk.Chunk.func_76624_a(Chunk.java:1249)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:153)
at net.minecraft.server.management.PlayerInstance.<init>(PlayerInstance.java:36)
at net.minecraft.server.management.PlayerManager.func_72690_a(SourceFile:172)
at net.minecraft.server.management.PlayerManager.func_72683_a(SourceFile:203)
at net.minecraft.server.management.ServerConfigurationManager.func_72375_a(ServerConfigurationManager.java:214)
at net.minecraft.server.management.ServerConfigurationManager.func_72377_c(ServerConfigurationManager.java:262)
at net.minecraft.server.management.ServerConfigurationManager.func_72355_a(ServerConfigurationManager.java:130)
at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:97)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:674)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:570)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:127)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:468)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)


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

-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_09, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 348461440 bytes (332 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 108 (6048 bytes; 0 MB) allocated, 108 (6048 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 71
FML: MCP v7.44 FML v5.1.38.667 Minecraft Forge 7.7.1.667 8 mods loaded, 8 mods active
mcp{7.44} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{5.1.38.667} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{7.7.1.667} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
GuiAPI{0.15.4} [GuiAPI] (GuiAPI-0.15.4-1.5.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Sushicraft{1.5.1} [[Sushicraft]] ([sushicraft] mod v. 8.0 [MC 1.5.1] [mod].zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CustomSpawner{1.12.2} [DrZhark's CustomSpawner] (CustomMobSpawner 1.12.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CustomNpcs{0.8} [CustomNpcs] (CustomNPCs_1.5.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MoCreatures{5.1.5} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v5.1.5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 86 (4816 bytes; 0 MB) allocated, 60 (3360 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['geschfiend'/10, l='Sandcastle', x=-545.04, y=69.00, z=-112.96]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'