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So I'm trying to do a modded survival and these two mods keep conflicting with each other. This is the crash report:

---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 6/20/13 11:03 PM
Description: Failed to start game

java.lang.IllegalArgumentException: Slot 4095 is already occupied by [email protected] when adding [email protected]
at net.minecraft.block.Block.<init>(Block.java:340)
at co.uk.flansmods.common.BlockPlaneWorkbench.<init>(BlockPlaneWorkbench.java:21)
at co.uk.flansmods.common.FlansMod.load(FlansMod.java:185)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:494)
at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
at com.google.common.eventbus.EventBus.post(EventBus.java:267)
at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:192)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:172)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
at com.google.common.eventbus.EventBus.post(EventBus.java:267)
at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:103)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:691)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:213)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:448)
at net.minecraft.client.MinecraftAppletImpl.func_71384_a(SourceFile:56)
at net.minecraft.client.Minecraft.run(Minecraft.java:733)
at java.lang.Thread.run(Thread.java:680)


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

-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Mac OS X (x86_64) version 10.6.8
Java Version: 1.6.0_51, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 465108176 bytes (443 MB) / 534708224 bytes (509 MB) up to 1069416448 bytes (1019 MB)
JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -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 v7.51 FML v5.2.23.737 Minecraft Forge 7.8.1.737 9 mods loaded, 9 mods active
mcp{7.51} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
FML{5.2.23.737} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized
Forge{7.8.1.737} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized
DamageIndicatorsMod{2.7.0.1} [Damage Indicators] (1.5.2 DamageIndicators v2.7.0.1) Unloaded->Constructed->Pre-initialized->Initialized
BiblioCraft{1.3.1} [BiblioCraft] (BiblioCraft[v1.3.1]) Unloaded->Constructed->Pre-initialized->Initialized
FlansMod{2.3.1} [Flan's Mod] (Flans Mod 2.3.1 for Minecraft 1.5.2 Universal.zip) Unloaded->Constructed->Pre-initialized->Errored
mod_ReiMinimap{v3.3_06 [1.5.2]} [mod_ReiMinimap] ([1.5.2]ReiMinimap_v3.3_06) Unloaded->Constructed->Pre-initialized->Initialized
Magical-Crops{2.1.2a} [Magical Crops] (magical_crops_1.5.1.2.1.2a) Unloaded->Constructed->Pre-initialized->Initialized
TC{4.0.1_002} [Traincraft] (traincraft-4.0.1_002) Unloaded->Constructed->Pre-initialized->Initialized
LWJGL: 2.4.2
OpenGL: Intel GMA 950 OpenGL Engine GL version 1.4 APPLE-1.6.36, Intel Inc.
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

Quote from RustyXXL

It's a simple BlockID conflict...change the BlockIDs in their configs

What do I change them to? I just tried changing the Flan's mod IDs but it still crashed.

its more like id problems and theres a problem with id because there are add on mods to add into flans you might have downloaded a added mod that is not compatiable in your flans folder

Quick question, how do you change the block ids?

Yayy! I am not the only person who uses a mac for gaming!