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---- Minecraft Crash Report ----
// Don't do that.

Time: 11/6/13 10:13 PM
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: assets/airi/src/extension/biological/BlockManager
at assets.avp.src.world.TerrainGenerator.generateSurface(TerrainGenerator.java:37)
at assets.avp.src.world.TerrainGenerator.generate(TerrainGenerator.java:18)
at cpw.mods.fml.common.registry.GameRegistry.generateWorld(GameRegistry.java:103)
at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:259)
at net.minecraft.world.chunk.Chunk.func_76624_a(Chunk.java:1253)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:153)
at net.minecraft.server.management.PlayerInstance.<init>(PlayerInstance.java:50)
at net.minecraft.server.management.PlayerManager.getOrCreateChunkWatcher(PlayerManager.java:192)
at net.minecraft.server.management.PlayerManager.func_72685_d(PlayerManager.java:369)
at net.minecraft.server.management.ServerConfigurationManager.func_72358_d(ServerConfigurationManager.java:282)
at net.minecraft.network.NetServerHandler.func_72498_a(NetServerHandler.java:405)
at net.minecraft.network.packet.Packet10Flying.func_73279_a(SourceFile:136)
at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89)
at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:141)
at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:54)
at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:109)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:691)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:175)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)
Caused by: java.lang.ClassNotFoundException: assets.airi.src.extension.biological.BlockManager
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 21 more
Caused by: java.lang.NullPointerException
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:178)
... 23 more


A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 288515304 bytes (275 MB) / 634359808 bytes (604 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 3635 (203560 bytes; 0 MB) allocated, 3496 (195776 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
FML: MCP v8.11 FML v6.4.20.916 Minecraft Forge 9.11.1.916 Optifine OptiFine_1.6.4_HD_U_C5 11 mods loaded, 11 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
FML{6.4.20.916} [Forge Mod Loader] (minecraftforge-9.11.1.916.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
Forge{9.11.1.916} [Minecraft Forge] (minecraftforge-9.11.1.916.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
DamageIndicatorsMod{2.9.0.0} [Damage Indicators] (1.6.2 DamageIndicators v2.9.0.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
mod_ReiMinimap{v3.4_01 [1.6.2]} [mod_ReiMinimap] ([1.6.4]ReiMinimap_v3.4_01.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
AIRi{1.9.0} [AIRi] (AIRiCore.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
AIRI Industrial Extension{1.0.0} [AIRI Industrial Extension] (AIRiIndustrial.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
AIRI Terrain Extension{1.0.0} [AIRI Terrain Extension] (AIRiTerrain.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
AliensVsPredator{ALPHA} [AliensVsPredator] (AliensVsPredator.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
CustomSpawner{2.3.0.dev1} [DrZhark's CustomSpawner] (CustomMobSpawner 2.3.0 DEV-R1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
MoCreatures{6.0.0.dev6} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6.0.0 DEV-R6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 3237 (181272 bytes; 0 MB) allocated, 3144 (176064 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['CyberCat5555'/25649, l='W9', x=800.06, y=65.00, z=1357.71]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'