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Not exactly sure how you define a good mesa biome seed, but here is one:
2408314293637812319

I'm having trouble setting the mod up. I put the mod in the mods folder and got this message when starting up mine craft (1.4.6).


--- BEGIN ERROR REPORT d61f563e --------
Full report at:
C:\Users\Griffin Heart\AppData\Roaming\.minecraft\crash-reports\crash-2013-01-17_18.33.58-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 1/17/13 6:33 PM

-- System Details --
Details:
Minecraft Version: 1.4.6
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_09, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 427730840 bytes (407 MB) / 514523136 bytes (490 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v7.25 FML v4.6.12.511 Minecraft Forge 6.5.0.467 9 mods loaded, 9 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized
mod_SonicMobs [mod_SonicMobs] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
mod_SonicMod [mod_SonicMod] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
quicksand-mod [Quicksand Mod] ([1.4.6][Forge]Quicksand Mod 3.0.2.jar) Unloaded->Constructed->Pre-initialized->Errored
MutantCreatures [Mutant Creatures] (Mutant Creatures v1.2.1 mc1.4.6.zip) Unloaded->Constructed->Pre-initialized->Initialized
mod_GenTest [mod_GenTest] (NewDun.1.4.6.zip) Unloaded->Constructed->Pre-initialized->Initialized
Pokeball [Pokeball] (Pokeball V1 - 1.4.6.zip) Unloaded->Constructed->Pre-initialized->Initialized
LWJGL: 2.4.2
OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 9.17.10.2817, Intel
Is Modded: Definitely; Client brand changed to 'forge,fml'
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

java.lang.IllegalArgumentException: Slot 250 is already occupied by BlockGreenHillGrassSlab@3af54caa when adding Quicksand.Common.QuicksandBlock@3e7c4b23
at amq.<init>(Block.java:324)
at Quicksand.Common.QuicksandBlock.<init>(QuicksandBlock.java:16)
at Quicksand.Common.mod_Quicksand.load(mod_Quicksand.java:33)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:478)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
at com.google.common.eventbus.EventBus.post(EventBus.java:268)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:140)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
at com.google.common.eventbus.EventBus.post(EventBus.java:268)
at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:83)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:656)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:207)
at net.minecraft.client.Minecraft.a(Minecraft.java:456)
at asq.a(SourceFile:56)
at net.minecraft.client.Minecraft.run(Minecraft.java:744)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT ef5a7632 ----------