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Ellian's Material detector won't work on my Minecraft.
Here's the crash-report:

---- Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 3/25/13 12:11 PM
Description: Unexpected error

java.lang.NoSuchFieldError: field_71439_g
at elliandetector.EllianDetector2MinecraftProxy.xCoord(EllianDetector2MinecraftProxy.java:168)
at elliandetector.EllianDetector.hasPlayerMoved(EllianDetector.java:270)
at elliandetector.EllianDetectorRunner.OnTickInGame(EllianDetectorRunner.java:82)
at mod_EllianDetector.onTickInGame(mod_EllianDetector.java:37)
at net.minecraft.src.BaseMod.doTickInGame(BaseMod.java:55)
at cpw.mods.fml.common.modloader.BaseModTicker.sendTick(BaseModTicker.java:102)
at cpw.mods.fml.common.modloader.BaseModTicker.tickBaseMod(BaseModTicker.java:82)
at cpw.mods.fml.common.modloader.BaseModTicker.tickEnd(BaseModTicker.java:56)
at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:34)
at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:140)
at cpw.mods.fml.common.FMLCommonHandler.onRenderTickEnd(FMLCommonHandler.java:379)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:869)
at net.minecraft.client.Minecraft.run(Minecraft.java:756)
at java.lang.Thread.run(Unknown Source)


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

-- Head --
Stacktrace:
at elliandetector.EllianDetector2MinecraftProxy.xCoord(EllianDetector2MinecraftProxy.java:168)
at elliandetector.EllianDetector.hasPlayerMoved(EllianDetector.java:270)
at elliandetector.EllianDetectorRunner.OnTickInGame(EllianDetectorRunner.java:82)
at mod_EllianDetector.onTickInGame(mod_EllianDetector.java:37)
at net.minecraft.src.BaseMod.doTickInGame(BaseMod.java:55)
at cpw.mods.fml.common.modloader.BaseModTicker.sendTick(BaseModTicker.java:102)
at cpw.mods.fml.common.modloader.BaseModTicker.tickBaseMod(BaseModTicker.java:82)
at cpw.mods.fml.common.modloader.BaseModTicker.tickEnd(BaseModTicker.java:56)
at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:34)
at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:140)

-- Affected level --
Details:
Level name: MpServer
All players: 6 total; [EntityClientPlayerMP['alienattacker123'/4278869, l='MpServer', x=313.00, y=131.62, z=480.00], EntityOtherPlayerMP['LOLEXPLOSION'/4273731, l='MpServer', x=313.00, y=130.00, z=480.00], EntityOtherPlayerMP['ishraq'/4049983, l='MpServer', x=310.59, y=136.09, z=481.13], EntityOtherPlayerMP['CelestialKeeper'/4077253, l='MpServer', x=313.47, y=130.00, z=480.50], EntityOtherPlayerMP['deanneriee_18'/4276197, l='MpServer', x=313.00, y=130.00, z=480.00], EntityOtherPlayerMP['Mamat08'/4278624, l='MpServer', x=313.00, y=130.00, z=480.00]]
Chunk stats: MultiplayerChunkCache: 40
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (313,130,480), Chunk: (at 9,8,0 in 19,30; contains blocks 304,0,480 to 319,255,495), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 8516967 game time, 10658072 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: 74 total; [EntityClientPlayerMP['alienattacker123'/4278869, l='MpServer', x=313.00, y=131.62, z=480.00], EntityOtherPlayerMP['ishraq'/4049983, l='MpServer', x=310.59, y=136.09, z=481.13], EntityOtherPlayerMP['LOLEXPLOSION'/4273731, l='MpServer', x=313.00, y=130.00, z=480.00], EntityOtherPlayerMP['ishraq'/4049983, l='MpServer', x=310.59, y=136.09, z=481.13], EntityOtherPlayerMP['CelestialKeeper'/4077253, l='MpServer', x=313.47, y=130.00, z=480.50], EntityOtherPlayerMP['deanneriee_18'/4276197, l='MpServer', x=313.00, y=130.00, z=480.00], EntityOtherPlayerMP['Mamat08'/4278624, l='MpServer', x=313.00, y=130.00, z=480.00], EntityItemFrame['entity.ItemFrame.name'/12, l='MpServer', x=292.06, y=48.50, z=459.50], EntityItemFrame['entity.ItemFrame.name'/13, l='MpServer', x=293.50, y=48.50, z=461.94], EntityItemFrame['entity.ItemFrame.name'/14, l='MpServer', x=297.06, y=48.50, z=464.50], EntityItemFrame['entity.ItemFrame.name'/15, l='MpServer', x=297.06, y=48.50, z=466.50], EntityItemFrame['entity.ItemFrame.name'/17, l='MpServer', x=296.06, y=46.50, z=509.50], EntityItemFrame['entity.ItemFrame.name'/16, l='MpServer', x=299.06, y=48.50, z=470.50], EntityItemFrame['entity.ItemFrame.name'/19, l='MpServer', x=296.06, y=46.50, z=511.50], EntityItemFrame['entity.ItemFrame.name'/18, l='MpServer', x=296.06, y=46.50, z=510.50], EntityItemFrame['entity.ItemFrame.name'/21, l='MpServer', x=296.06, y=46.50, z=512.50], EntityOtherPlayerMP['LOLEXPLOSION'/4273731, l='MpServer', x=313.00, y=130.00, z=480.00], EntityItemFrame['entity.ItemFrame.name'/20, l='MpServer', x=301.50, y=47.50, z=506.06], EntityItemFrame['entity.ItemFrame.name'/22, l='MpServer', x=303.94, y=46.50, z=513.50], EntityItemFrame['entity.ItemFrame.name'/25, l='MpServer', x=310.50, y=136.50, z=451.06], EntityItemFrame['entity.ItemFrame.name'/27, l='MpServer', x=315.50, y=130.50, z=476.06], EntityItemFrame['entity.ItemFrame.name'/26, l='MpServer', x=316.50, y=136.50, z=451.06], EntityItemFrame['entity.ItemFrame.name'/29, l='MpServer', x=317.94, y=130.50, z=478.50], EntityOtherPlayerMP['CelestialKeeper'/4077253, l='MpServer', x=313.47, y=130.00, z=480.50], EntityItemFrame['entity.ItemFrame.name'/28, l='MpServer', x=309.06, y=130.50, z=478.50], EntityItemFrame['entity.ItemFrame.name'/30, l='MpServer', x=311.50, y=130.50, z=476.06], EntityItemFrame['entity.ItemFrame.name'/34, l='MpServer', x=317.94, y=130.50, z=482.50], EntityItemFrame['entity.ItemFrame.name'/35, l='MpServer', x=315.50, y=130.50, z=484.94], EntityItemFrame['entity.ItemFrame.name'/32, l='MpServer', x=309.06, y=130.50, z=482.50], EntityItemFrame['entity.ItemFrame.name'/33, l='MpServer', x=311.50, y=130.50, z=484.94], EntityItemFrame['entity.ItemFrame.name'/42, l='MpServer', x=313.06, y=57.50, z=509.50], EntityItemFrame['entity.ItemFrame.name'/43, l='MpServer', x=313.06, y=57.50, z=510.50], EntityItemFrame['entity.ItemFrame.name'/41, l='MpServer', x=304.94, y=47.50, z=509.50], EntityItemFrame['entity.ItemFrame.name'/46, l='MpServer', x=313.06, y=57.50, z=507.50], EntityItemFrame['entity.ItemFrame.name'/47, l='MpServer', x=313.06, y=57.50, z=506.50], EntityItemFrame['entity.ItemFrame.name'/44, l='MpServer', x=313.06, y=57.50, z=511.50], EntityItemFrame['entity.ItemFrame.name'/45, l='MpServer', x=313.06, y=57.50, z=508.50], EntityItemFrame['entity.ItemFrame.name'/51, l='MpServer', x=318.94, y=57.50, z=507.50], EntityItemFrame['entity.ItemFrame.name'/50, l='MpServer', x=318.94, y=57.50, z=508.50], EntityItemFrame['entity.ItemFrame.name'/49, l='MpServer', x=318.94, y=57.50, z=509.50], EntityItemFrame['entity.ItemFrame.name'/48, l='MpServer', x=313.06, y=57.50, z=505.50], EntityItemFrame['entity.ItemFrame.name'/55, l='MpServer', x=313.06, y=57.50, z=514.50], EntityItemFrame['entity.ItemFrame.name'/54, l='MpServer', x=313.06, y=57.50, z=513.50], EntityItemFrame['entity.ItemFrame.name'/53, l='MpServer', x=313.06, y=57.50, z=512.50], EntityItemFrame['entity.ItemFrame.name'/52, l='MpServer', x=318.94, y=57.50, z=506.50], EntityItemFrame['entity.ItemFrame.name'/59, l='MpServer', x=319.94, y=57.50, z=515.50], EntityItemFrame['entity.ItemFrame.name'/58, l='MpServer', x=319.94, y=57.50, z=514.50], EntityItemFrame['entity.ItemFrame.name'/57, l='MpServer', x=313.06, y=57.50, z=516.50], EntityOtherPlayerMP['deanneriee_18'/4276197, l='MpServer', x=313.00, y=130.00, z=480.00], EntityItemFrame['entity.ItemFrame.name'/56, l='MpServer', x=313.06, y=57.50, z=515.50], EntityItemFrame['entity.ItemFrame.name'/63, l='MpServer', x=324.06, y=46.50, z=453.50], EntityItemFrame['entity.ItemFrame.name'/62, l='MpServer', x=319.94, y=57.50, z=518.50], EntityOtherPlayerMP['Mamat08'/4278624, l='MpServer', x=313.00, y=130.00, z=480.00], EntityItemFrame['entity.ItemFrame.name'/61, l='MpServer', x=319.94, y=57.50, z=517.50], EntityItemFrame['entity.ItemFrame.name'/60, l='MpServer', x=319.94, y=57.50, z=516.50], EntityItemFrame['entity.ItemFrame.name'/68, l='MpServer', x=347.50, y=45.50, z=465.06], EntityItemFrame['entity.ItemFrame.name'/69, l='MpServer', x=348.50, y=45.50, z=465.06], EntityItemFrame['entity.ItemFrame.name'/70, l='MpServer', x=344.50, y=45.50, z=465.06], EntityItemFrame['entity.ItemFrame.name'/71, l='MpServer', x=345.06, y=46.50, z=491.50], EntityItemFrame['entity.ItemFrame.name'/64, l='MpServer', x=331.94, y=46.50, z=456.50], EntityItemFrame['entity.ItemFrame.name'/65, l='MpServer', x=327.50, y=46.50, z=450.06], EntityItemFrame['entity.ItemFrame.name'/66, l='MpServer', x=345.50, y=45.50, z=465.06], EntityItemFrame['entity.ItemFrame.name'/67, l='MpServer', x=346.50, y=45.50, z=465.06], EntityItemFrame['entity.ItemFrame.name'/76, l='MpServer', x=349.50, y=50.50, z=491.94], EntityItemFrame['entity.ItemFrame.name'/77, l='MpServer', x=349.50, y=54.50, z=491.94], EntityItemFrame['entity.ItemFrame.name'/78, l='MpServer', x=349.50, y=54.50, z=489.06], EntityItemFrame['entity.ItemFrame.name'/79, l='MpServer', x=349.94, y=46.50, z=500.50], EntityItemFrame['entity.ItemFrame.name'/72, l='MpServer', x=345.06, y=46.50, z=489.50], EntityItemFrame['entity.ItemFrame.name'/73, l='MpServer', x=350.50, y=46.50, z=485.06], EntityItemFrame['entity.ItemFrame.name'/74, l='MpServer', x=348.50, y=46.50, z=485.06], EntityItemFrame['entity.ItemFrame.name'/75, l='MpServer', x=349.50, y=50.50, z=489.06], EntityItemFrame['entity.ItemFrame.name'/80, l='MpServer', x=349.94, y=46.50, z=501.50], EntityItemFrame['entity.ItemFrame.name'/83, l='MpServer', x=352.94, y=46.50, z=487.50], EntityItemFrame['entity.ItemFrame.name'/82, l='MpServer', x=352.94, y=46.50, z=490.50]]
Retry entities: 0 total; []
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:441)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2405)
at net.minecraft.client.Minecraft.run(Minecraft.java:779)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_17, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 384024824 bytes (366 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -Xms512m -Xmx512m
AABB Pool Size: 22 (1232 bytes; 0 MB) allocated, 22 (1232 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v7.44 FML v5.1.8.608 Minecraft Forge 7.7.0.608 Optifine OptiFine_1.5.1_HD_U_A8 4 mods loaded, 4 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod_EllianDetector [mod_EllianDetector] (EllianDetector.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
LWJGL: 2.4.2
OpenGL: Intel Pineview Platform GL version 1.4.0 - Build 8.14.10.2117, Intel
Is Modded: Definitely; Client brand changed to 'forge,fml'
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 37 (2072 bytes; 0 MB) allocated, 37 (2072 bytes; 0 MB) used