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I'm having this really annoying problem trying to install mods for 1.5.2. I installed forge just fine for the 1.5.2 client, but I tried installing pixelmon afterwards, and I got a crash saying failed to start game. This has also occurred when trying to install any other mod on my client. It doesn't matter which mod, it keeps crashing my client. Could somebody please assist me on fixing this issue? This is my latest crash report:

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

Time: 09/06/13 6:37 PM
Description: Failed to start game

java.lang.ClassCastException: pixelmon.blocks.BlockHealer cannot be cast to cpw.mods.fml.common.registry.BlockProxy
at cpw.mods.fml.common.registry.GameRegistry.registerBlock(GameRegistry.java:234)
at cpw.mods.fml.common.registry.GameRegistry.registerBlock(GameRegistry.java:195)
at cpw.mods.fml.common.registry.GameRegistry.registerBlock(GameRegistry.java:171)
at pixelmon.config.PixelmonBlocks.registerBlocks(PixelmonBlocks.java:118)
at pixelmon.config.PixelmonConfig.loadConfig(PixelmonConfig.java:71)
at pixelmon.Pixelmon.preInit(Pixelmon.java:87)
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:494)
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: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:186)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:166)
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: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.loadMods(Loader.java:515)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:163)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:411)
at net.minecraft.client.MinecraftAppletImpl.func_71384_a(SourceFile:56)
at net.minecraft.client.Minecraft.run(Minecraft.java:733)
at java.lang.Thread.run(Unknown Source)


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: Windows 7 (x86) version 6.1
Java Version: 1.7.0_17, Oracle Corporation
Java VM Version: Java HotSpot™ Client VM (mixed mode), Oracle Corporation
Memory: 453335072 bytes (432 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 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 v7.51 FML v5.2.21.729 Minecraft Forge 7.8.0.729 4 mods loaded, 4 mods active
mcp{7.44} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized
FML{5.2.21.729} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized
Forge{7.8.0.729} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized
Pixelmon{2.2} [Pixelmon] (Pixelmon 2.2.zip) Unloaded->Constructed->Errored
LWJGL: 2.4.2
OpenGL: AMD Radeon™ HD 6480G GL version 4.1.11165 Compatibility Profile Context, ATI Technologies 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

"This has also occurred when trying to install any other mod on my client."

every mod that I try to install makes my minecraft crash, except for forge. It isn't just pixelmon that causes this crash, every mod I try to install does, and I don't have any other mods installed other than forge, and that's what's confusing me. Why is it crashing then?

bump?

Do you install the mods by using the mods folder or do you install them into the minecraft.jar?

Make sure to check which way your supposed to install it.