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So, I updated to 1.6.4 and not alot of mods have updated yet. I also heard that mo creatures 1.6.2 works for 1.6.4 but I keep getting a crash report. I have forge 1.6.4 currently and the custommobspawner doesn't work as well. Mo creatures is my favorite mod, next to jammy furniture which they haven't updated yet either. So, is there any way to fix it so I can have these mods. (Mo creatures and Custommobspawner)

Crash report:
---- Minecraft Crash Report ----
// Ooh. Shiny.
Time: 10/15/13 5:33 PM
Description: Initializing game
java.lang.NoClassDefFoundError: de/matthiasmann/twl/Widget
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at cpw.mods.fml.common.ProxyInjector.inject(ProxyInjector.java:58)
at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:519)
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:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
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:194)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:174)
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:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
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:105)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:509)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:181)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:471)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:806)
at net.minecraft.client.main.Main.main(SourceFile:101)
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 net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
Caused by: java.lang.ClassNotFoundException: de.matthiasmann.twl.Widget
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:179)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 36 more
Caused by: java.lang.NullPointerException

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at cpw.mods.fml.common.ProxyInjector.inject(ProxyInjector.java:58)
at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:519)
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:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
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:194)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:174)
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:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
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:105)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:509)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:181)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:471)
-- Initialization --
Details:
Stacktrace:
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:806)
at net.minecraft.client.main.Main.main(SourceFile:101)
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 net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.6.0_22, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
Memory: 278149904 bytes (265 MB) / 445644800 bytes (425 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
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 v8.11 FML v6.4.6.884 Minecraft Forge 9.11.0.884 22 mods loaded, 22 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed
FML{6.4.6.884} [Forge Mod Loader] (minecraftforge-9.11.0.884.jar) Unloaded->Constructed
Forge{9.11.0.884} [Minecraft Forge] (minecraftforge-9.11.0.884.jar) Unloaded->Constructed
TooManyItems{1.6.4} [TooManyItems] (minecraft.jar) Unloaded->Constructed
mod_bspkrsCore{v3.05(1.6.4)} [bspkrsCore] ([1.6.4]bspkrsCorev3.05.zip) Unloaded->Constructed
FamiliarsAPI{1.6.4} [Familiars API] (Familiars_API_1.6.4a.zip) Unloaded->Constructed
DamageIndicatorsMod{2.9.0.9} [Damage Indicators] (1.6.4 DamageIndicators v2.9.0.9.zip) Unloaded->Constructed
mod_ReiMinimap{v3.4_01 [1.6.2]} [mod_ReiMinimap] ([1.6.4]ReiMinimap_v3.4_01.zip) Unloaded->Constructed
TreeCapitator{Forge 1.6.4.r02} [Treecapitator] ([1.6.4]TreeCapitator.Forge.1.6.4.r02.Universal.jar) Unloaded->Constructed
cfm{3.1.1} [§4MrCrayfish's Furniture Mod] ([Forge]FurnitureModv3.1.1(1.6.4).zip) Unloaded->Constructed
BiblioCraft{1.4.1} [BiblioCraft] (BiblioCraft[v1.4.1].zip) Unloaded->Constructed
craftguide{1.5.2} [CraftGuide] (CraftGuide-1.6.7.4.zip) Unloaded->Constructed
CustomSpawner{2.3.0.dev1} [DrZhark's CustomSpawner] (CustomMobSpawner 2.3.0 DEV-R1.zip) Unloaded->Constructed
MoCreatures{6.0.0.dev5} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6.0.0 DEV-R5.zip) Unloaded
FamiliarsDefaultMobPack{1.6.4} [Familiars DefaultMobPack] (Familiars_DefaultMobPack_1.6.4a.zip) Unloaded
FamiliarsExtendedFamPack{1.6.4} [Familiars ExtendedFamPack] (Familiars_ExtendedFamPack_1.6.4a.zip) Unloaded
mca{3.5.1} [Minecraft Comes Alive] (MCA v3.5.1.zip) Unloaded
rpginventorymod{1.6.4} [RPG Inventory Mod] (RpgInventory 1.6.4 v1 Complete.zip) Unloaded
RPGPlusPlus{RpgInv8.4} [Subarakis RPG++ mod] (RpgInventory 1.6.4 v1 Complete.zip) Unloaded
RPGRB{RpgInv8.4} [Rogue and BeastMaster Patch] (RpgInventory 1.6.4 v1 Complete.zip) Unloaded
VanillaShields{RpgInv8.4} [Vanilla Shields Mod] (RpgInventory 1.6.4 v1 Complete.zip) Unloaded
RPGMS{RpgInv8.4} [RpgInv Mage Addon] (RpgInventory 1.6.4 v1 Complete.zip) Unloaded
Launched Version: 1.6.4-Forge9.11.0.884
LWJGL: 2.9.0
OpenGL: Intel(R) HD Graphics 3000 GL version 3.1.0 - Build 9.17.10.2932, Intel
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Pack: ElvelandLight_v161.zip
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

Hey! You ain't dumb!

Quote from cynder5678

I got the exact same thing (apart from the mod list at the bottom, that was different.) What i did was check I installed guiAPI
(http://www.mediafire....15.7-1.6.2.jar) and made sure my browser didn't call it with a .zip at the end (meaning its .zip not .jar) if its a .zip go into your control panel > appearance and personalisation > folder options and scroll down on 'View' and untick 'Hide extensions for known files' then rename the guiAPI Only take away the .zip.

Then put the GuiAPI in your mods folder and mo' creatures should work.

Glad I could help,

Cynder



I mean the bit where it says all your mods as the modlist (some ppl are dumb like me :3)

This helped a lot, thx