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Whenever I install optifine it works fine... until i open a world or enter a multiplayer. does anyone know whats happening with this?

Minecraft has crashed!
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Minecraft has stopped running because it encountered a problem; Unexpected error
This error has been saved to C:\Users\steven\AppData\Roaming\.minecraft\crash-reports\crash-2012-11-01_23.09.15-client.txt for your convenience. Please include a copy of this file if you report this crash to anyone.



--- BEGIN ERROR REPORT 78b614a5 --------
Generated 11/1/12 11:09 PM

- Minecraft Version: 1.4.2
- Operating System: Windows 7 (x86) version 6.1
- Java Version: 1.7.0_09, Oracle Corporation
- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
- Memory: 322880728 bytes (307 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- AABB Pool Size: 386 (21616 bytes; 0 MB) allocated, 386 (21616 bytes; 0 MB) used
- LWJGL: 2.4.2
- OpenGL: ATI Radeon HD 5450 GL version 4.2.11931 Compatibility Profile Context, ATI Technologies Inc.
- Is Modded: Very likely
- Type: Client
- Texture Pack: Dokucraft High 1.4.2
- Profiler Position: N/A (disabled)
- Vec3 Pool Size: 157 (8792 bytes; 0 MB) allocated, 157 (8792 bytes; 0 MB) used
- World MpServer Entities: 9 total; [axc['xRaDiAtIoNzZ23'/314, l='MpServer', x=-62.48, y=64.62, z=417.63], og['Bat'/110, l='MpServer', x=-63.81, y=20.63, z=442.38], og['Bat'/125, l='MpServer', x=-61.47, y=17.69, z=440.40], pl['Creeper'/124, l='MpServer', x=-57.00, y=49.00, z=420.56], pl['Creeper'/123, l='MpServer', x=-48.50, y=51.00, z=426.50], og['Bat'/122, l='MpServer', x=-53.36, y=16.58, z=429.68], pl['Creeper'/121, l='MpServer', x=-50.44, y=22.00, z=429.50], og['Bat'/163, l='MpServer', x=0.07, y=21.99, z=379.37], og['Bat'/138, l='MpServer', x=-20.75, y=26.52, z=369.23]]
- World MpServer Players: 1 total; [axc['xRaDiAtIoNzZ23'/314, l='MpServer', x=-62.48, y=64.62, z=417.63]]
- World MpServer Chunk Stats: MultiplayerChunkCache: 110
- Forced Entities: 9 total; [og['Bat'/138, l='MpServer', x=-20.75, y=26.52, z=369.23], axc['xRaDiAtIoNzZ23'/314, l='MpServer', x=-62.48, y=64.62, z=417.63], og['Bat'/163, l='MpServer', x=0.07, y=21.99, z=379.37], og['Bat'/110, l='MpServer', x=-63.81, y=20.63, z=442.38], og['Bat'/125, l='MpServer', x=-61.47, y=17.69, z=440.40], pl['Creeper'/124, l='MpServer', x=-57.00, y=49.00, z=420.56], pl['Creeper'/123, l='MpServer', x=-48.50, y=51.00, z=426.50], og['Bat'/122, l='MpServer', x=-53.36, y=16.58, z=429.68], pl['Creeper'/121, l='MpServer', x=-50.44, y=22.00, z=429.50]]
- Retry Entities: 0 total; []

java.lang.NoSuchFieldError: randomMobsInfo
at com.pclewis.mcpatcher.mod.MobRandomizer$ExtraInfo.getInfo(MobRandomizer.java:86)
at com.pclewis.mcpatcher.mod.MobRandomizer.randomTexture(MobRandomizer.java:32)
at com.pclewis.mcpatcher.mod.MobRandomizer.randomTexture(MobRandomizer.java:25)
at bal.a(SourceFile:190)
at bal.a(SourceFile:76)
at bal.a(SourceFile:12)
at azw.a(SourceFile:180)
at azw.a(SourceFile:173)
at ayy.a(RenderGlobal.java:474)
at ayt.a(EntityRenderer.java:1569)
at ayt.b(EntityRenderer.java:1122)
at net.minecraft.client.Minecraft.J(SourceFile:604)
at net.minecraft.client.Minecraft.run(SourceFile:534)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT ca1c7de5 ----------