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This is the last error report:

Minecraft has crashed!
----------------------
Minecraft has stopped running because it encountered a problem; Exception in server tick loop
A full error report has been saved to C:\Users\Cvors_000\AppData\Roaming\.minecraft\crash-reports\crash-2013-06-19_09.46.17-server.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash

--- BEGIN ERROR REPORT 2adf5223 --------
Full report at:
C:\Users\Cvors_000\AppData\Roaming\.minecraft\crash-reports\crash-2013-06-19_09.46.17-server.txt
Please show that file to Mojang, NOT just this screen!
Generated 6/19/13 9:46 AM
-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Windows 8 (x86) version 6.2
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot™ Client VM (mixed mode), Oracle Corporation
Memory: 379643768 bytes (362 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 23 (1288 bytes; 0 MB) allocated, 23 (1288 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 71
FML: MCP v7.51 FML v5.2.2.684 Minecraft Forge 7.8.0.684 11 mods loaded, 11 mods active
mcp{7.44} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{5.2.2.684} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{7.8.0.684} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
GuiAPI{0.15.6} [GuiAPI] (GuiAPI-0.15.6-1.5.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_ReiMinimap{v3.3_06 [1.5.2]} [mod_ReiMinimap] ([1.5.2]ReiMinimap_v3.3_06.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Backpack{1.9.11} [Backpack] (backpack-1.9.11-1.5.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CustomSpawner{2.2.2} [DrZhark's CustomSpawner] (CustomMobSpawner 2.2.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MoCreatures{5.2.3} [DrZhark's Mo'Creatures Mod] (DrZhark's Mo'Creatures Mod v5.2.3.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
LotsOfFood{1.5.2} [Lots of Food] (Lots of Food 1.5.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
More Bows{1.5_v1} [More Bows mod] (More bows 1.5.2_2 Forge.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
teeluk_SpecialArmor{1.5.1} [SpecialArmor] (Special-Armor-Mod-1.5.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 2 (112 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['Emerrione'/292, l='Tresu', x=-1400.22, y=65.00, z=-1521.20]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'
java.lang.IllegalArgumentException: n must be positive
at java.util.Random.nextInt(Unknown Source)
at drzhark.customspawner.CustomSpawner.performWorldGenSpawning(CustomSpawner.java:1065)
at drzhark.mocreatures.MoCEventHooks.peformCustomWorldGenSpawning(MoCEventHooks.java:38)
at net.minecraftforge.event.ASMEventHandler_6_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:564)
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:675)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:571)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:127)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:469)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)
--- END ERROR REPORT d6eea287 ----------

Does anyone know what I need to fix?