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So I just updated my minecraft to 1.5 and after a lot of trouble with mods and forge I managed to get it working. But.... not quite. Every time I try to start a new world it just crashes. Here is the error: ---- Minecraft Crash Report ----
// Sorry
Time: 3/13/13 7:39 PM
Description: Exception ticking world
java.lang.NoSuchFieldError: captureDrops
at sd.bJ(EntityZombie.java:380)
at aah.a(SourceFile:162)
at aah.a(SourceFile:139)
at iz.b(SourceFile:119)
at net.minecraft.server.MinecraftServer.r(SourceFile:454)
at net.minecraft.server.MinecraftServer.q(SourceFile:397)
at bja.q(SourceFile:122)
at net.minecraft.server.MinecraftServer.run(SourceFile:331)
at gp.run(SourceFile:573)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at sd.bJ(EntityZombie.java:380)
at aah.a(SourceFile:162)
at aah.a(SourceFile:139)
at iz.b(SourceFile:119)
-- Affected level --
Details:
Level name: World 1
All players: 1 total; [jc['Cataclysm_7'/5288, l='World 1', x=210.50, y=71.00, z=219.50]]
Chunk stats: ServerChunkCache: 625 Drop: 0
Level seed: 658688097
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (208,64,224), Chunk: (at 0,4,0 in 13,14; contains blocks 208,0,224 to 223,255,239), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 1 game time, 1 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 29747 (now: false), thunder time: 163181 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.r(SourceFile:454)
at net.minecraft.server.MinecraftServer.q(SourceFile:397)
at bja.q(SourceFile:122)
at net.minecraft.server.MinecraftServer.run(SourceFile:331)
at gp.run(SourceFile:573)
-- System Details --
Details:
Minecraft Version: 1.5
Operating System: Windows XP (x86) version 5.1
Java Version: 1.7.0_13, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 276722304 bytes (263 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -Xms512m -Xmx512m
AABB Pool Size: 2769 (155064 bytes; 0 MB) allocated, 21 (1176 bytes; 0 MB) used
Suspicious classes: _tmi_MgButtonHandler, _tmi_MgItemHandler, _tmi_MgFocusHandler, ...[reifnsk.minimap.ReiMinimap, WaypointEntity, MinimapException, ...]
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
Profiler Position: N/A (disabled)
Vec3 Pool Size: 413 (23128 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 1 / 8; [jc['Cataclysm_7'/5288, l='World 1', x=210.50, y=71.00, z=219.50]]
Type: Integrated Server (map_client.txt)
Is Modded: Very likely; Jar signature invalidated