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Vanilla minecraft doesn't crash when I open inventory, but when I install mods like single player commands, mo creatures, etc. whenever I open the inventory minecraft crashes. Here is the crash report:

---- Minecraft Crash Report ----
// Ooh. Shiny.

Time: 14/03/13 9:18 PM
Description: Unexpected error

java.lang.VerifyError: (class: aza, method: A_ signature: ()V) Incompatible argument to function
at net.minecraft.client.Minecraft.l(SourceFile:1264)
at net.minecraft.client.Minecraft.K(SourceFile:572)
at net.minecraft.client.Minecraft.run(SourceFile:524)
at java.lang.Thread.run(Unknown Source)


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

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [bdp['SkyWatcher52'/0, l='MpServer', x=182.43, y=78.62, z=151.66]]
Chunk stats: MultiplayerChunkCache: 180
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (172,4,147), Chunk: (at 12,0,3 in 10,9; contains blocks 160,0,144 to 175,255,159), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 95 game time, 95 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 1 total; [bdp['SkyWatcher52'/0, l='MpServer', x=182.43, y=78.62, z=151.66]]
Retry entities: 0 total; []
Stacktrace:
at bdm.a(SourceFile:282)
at net.minecraft.client.Minecraft.b(SourceFile:1879)
at net.minecraft.client.Minecraft.run(SourceFile:538)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.5
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_15, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 322134888 bytes (307 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 13190 (738640 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
LWJGL: 2.4.2
OpenGL: AMD Radeon HD 7670M GL version 4.2.11411 Compatibility Profile Context, ATI Technologies Inc.
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 204 (11424 bytes; 0 MB) allocated, 18 (1008 bytes; 0 MB) used

Quote from webrosc

mo creatures isn't updated to 1.5 yet, that maybe the issue
http://www.minecraft...e-fairy-horses/

I tried other mods without mo creatures, single player commands, too many items, and it all crashes when I open the inventory. SPC is updated for 1.5 and probably tmi but I'm not sure.

The same thing was happening to my friend, It is because he had an Outdated Mod installed (SPC). To fix this and save all your worlds do the Following (this is for Windowns 7)


ALWAYS BACK UP YOUR MINECRAFT


1.Type in search bar %appdata%
2.Click on the file Roaming
3.Click on your .Minecraft
4.Click on the folder Saves
5.Drag them all on to your Desktop (Or where ever you would like so long as you can access them all easily)
6.Go back to your Roaming and Delete you .Minecraft
7.Open up Minecraft and Let it Re-load your .Minecraft
8.When it is finished close Minecraft
9.Do %appdata% in the Search bar
10.Click on the Roaming file
11.Go into your .minecraft
12.Go into your Saves
13. Make the tab the half the size of the screen so you can see all your saved worlds on your Desktop or other folder
14.Drag them all into the saves folder
15. Close your saves folder and Open up Minecraft and your Worlds should be in there

(This will also work for Mac, except getting to your .minecraft is different, Sadly I do not know how to get to it on a Mac. Although its the same Concept)