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I've got a Windows 7 x86 PC, with 4 GB RAM and Nvidia Quadro FX 1700 video card...well above specs and drivers updated this week.

I downloaded the Fossils Archeology Mod and whenever I press "E" for inventory, it crashes immediately.

How can I fix this? Crash report below.

---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.
Time: 3/1/13 7:47 PM
Description: Unexpected error
java.lang.VerifyError: (class: avz, method: a signature: (Latb;)V) Incompatible argument to function
at net.minecraft.client.Minecraft.l(SourceFile:1273)
at net.minecraft.client.Minecraft.J(SourceFile:582)
at net.minecraft.client.Minecraft.run(SourceFile:534)
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; [ays['rot555333'/457, l='MpServer', x=15.96, y=64.62, z=297.30]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (136,64,248), Chunk: (at 8,4,8 in 8,15; contains blocks 128,0,240 to 143,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 247527 game time, 269330 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: true), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 86 total; [ow['Bat'/1, l='MpServer', x=-54.14, y=33.60, z=242.01], ow['Bat'/2, l='MpServer', x=-60.38, y=33.67, z=233.41], oy['Chicken'/3, l='MpServer', x=-57.63, y=64.00, z=235.53], oy['Chicken'/4, l='MpServer', x=-64.41, y=63.00, z=241.47], oy['Chicken'/6, l='MpServer', x=-56.52, y=68.62, z=250.55], oy['Chicken'/8, l='MpServer', x=-50.53, y=64.00, z=241.47], oy['Chicken'/129, l='MpServer', x=42.41, y=67.00, z=362.44], oy['Chicken'/9, l='MpServer', x=-53.83, y=62.56, z=287.35], oy['Chicken'/128, l='MpServer', x=47.31, y=64.00, z=336.47], oy['Chicken'/131, l='MpServer', x=39.38, y=64.00, z=365.59], oy['Chicken'/11, l='MpServer', x=-62.31, y=73.00, z=277.47], oy['Chicken'/130, l='MpServer', x=42.59, y=68.00, z=364.66], oy['Chicken'/12, l='MpServer', x=-57.38, y=66.00, z=276.69], oy['Chicken'/135, l='MpServer', x=43.50, y=67.00, z=372.50], oy['Chicken'/14, l='MpServer', x=-35.47, y=68.00, z=234.44], px['item.item.egg'/134, l='MpServer', x=40.38, y=66.13, z=363.44], oy['Chicken'/15, l='MpServer', x=-40.41, y=65.00, z=247.53], ph['Squid'/152, l='MpServer', x=55.45, y=59.28, z=258.84], oy['Chicken'/17, l='MpServer', x=-46.47, y=67.00, z=241.56], px['item.item.egg'/16, l='MpServer', x=-38.47, y=64.13, z=251.66], ph['Squid'/153, l='MpServer', x=51.00, y=61.34, z=260.50], ph['Squid'/154, l='MpServer', x=58.71, y=59.18, z=264.52], oy['Chicken'/19, l='MpServer', x=-46.56, y=70.00, z=258.47], ph['Squid'/155, l='MpServer', x=52.78, y=61.00, z=253.21], ow['Bat'/18, l='MpServer', x=-43.21, y=25.85, z=255.26], ph['Squid'/156, l='MpServer', x=59.59, y=59.00, z=284.90], qu['Villager'/21, l='MpServer', x=-47.69, y=82.00, z=322.91], ph['Squid'/157, l='MpServer', x=56.12, y=61.38, z=285.51], qu['Villager'/20, l='MpServer', x=-47.69, y=82.00, z=323.69], ph['Squid'/158, l='MpServer', x=59.40, y=59.22, z=279.94], qu['Villager'/23, l='MpServer', x=-47.66, y=82.00, z=320.97], ph['Squid'/159, l='MpServer', x=56.23, y=56.68, z=284.73], qu['Villager'/22, l='MpServer', x=-44.31, y=83.00, z=323.69], qu['Villager'/25, l='MpServer', x=-46.75, y=82.00, z=322.66], oy['Chicken'/145, l='MpServer', x=51.47, y=62.44, z=234.53], qu['Villager'/24, l='MpServer', x=-47.31, y=82.00, z=320.97], ph['Squid'/148, l='MpServer', x=53.33, y=59.93, z=239.60], ph['Squid'/149, l='MpServer', x=51.59, y=60.00, z=246.43], ph['Squid'/150, l='MpServer', x=60.51, y=61.84, z=247.90], ph['Squid'/151, l='MpServer', x=52.63, y=60.67, z=248.43], ph['Squid'/175, l='MpServer', x=65.05, y=56.00, z=309.69], oy['Chicken'/38, l='MpServer', x=-25.44, y=66.00, z=260.53], px['item.item.egg'/39, l='MpServer', x=-18.50, y=66.13, z=256.28], ph['Squid'/172, l='MpServer', x=68.97, y=56.00, z=234.37], oy['Chicken'/37, l='MpServer', x=-20.47, y=66.00, z=255.47], oy['Chicken'/163, l='MpServer', x=54.34, y=63.00, z=335.41], ow['Bat'/162, l='MpServer', x=49.69, y=22.01, z=301.11], ph['Squid'/161, l='MpServer', x=54.56, y=58.44, z=287.53], ph['Squid'/160, l='MpServer', x=54.31, y=57.26, z=282.78], oy['Chicken'/46, l='MpServer', x=-9.44, y=66.00, z=249.59], px['item.item.egg'/47, l='MpServer', x=-5.50, y=65.13, z=247.31], ow['Bat'/166, l='MpServer', x=52.42, y=50.24, z=338.97], ow['Bat'/165, l='MpServer', x=55.27, y=48.60, z=344.66], oy['Chicken'/45, l='MpServer', x=-4.50, y=66.00, z=239.53], oy['Chicken'/164, l='MpServer', x=48.28, y=64.00, z=328.06], ph['Squid'/51, l='MpServer', x=-14.13, y=59.37, z=342.50], ph['Squid'/50, l='MpServer', x=-10.27, y=58.81, z=342.32], oy['Chicken'/49, l='MpServer', x=-15.03, y=67.00, z=260.59], oy['Chicken'/48, l='MpServer', x=-15.42, y=66.28, z=259.34], ph['Squid'/53, l='MpServer', x=-8.55, y=58.71, z=346.59], ph['Squid'/52, l='MpServer', x=-2.59, y=60.38, z=345.46], oy['Chicken'/201, l='MpServer', x=86.47, y=67.00, z=281.38], pv['Boat'/76, l='MpServer', x=13.50, y=63.45, z=283.50], pd['Pig'/77, l='MpServer', x=12.50, y=63.00, z=300.25], pv['Boat'/78, l='MpServer', x=5.56, y=63.58, z=301.53], pv['Boat'/79, l='MpServer', x=2.22, y=63.41, z=306.78], oy['Chicken'/73, l='MpServer', x=8.34, y=67.00, z=232.44], pv['Boat'/75, l='MpServer', x=10.50, y=63.41, z=282.50], ow['Bat'/80, l='MpServer', x=12.89, y=22.26, z=357.00], oy['Chicken'/509, l='MpServer', x=-64.34, y=70.00, z=278.47], oy['Chicken'/507, l='MpServer', x=-65.41, y=64.00, z=243.53], pd['Pig'/119, l='MpServer', x=36.91, y=63.00, z=285.88], pb['Mooshroom'/118, l='MpServer', x=35.59, y=63.00, z=288.76], ays['rot555333'/457, l='MpServer', x=15.96, y=64.62, z=297.30], pe['Sheep'/117, l='MpServer', x=32.47, y=63.00, z=285.09], px['item.item.egg'/116, l='MpServer', x=40.31, y=63.13, z=241.00], oy['Chicken'/115, l='MpServer', x=36.90, y=63.00, z=238.29], ow['Bat'/113, l='MpServer', x=41.15, y=32.10, z=221.78], px['item.item.egg'/127, l='MpServer', x=45.38, y=63.13, z=336.97], px['item.item.egg'/126, l='MpServer', x=43.38, y=65.13, z=331.09], oy['Chicken'/125, l='MpServer', x=43.47, y=65.00, z=329.59], pb['Mooshroom'/124, l='MpServer', x=32.13, y=63.00, z=289.64], oz['Cow'/123, l='MpServer', x=34.56, y=63.00, z=287.34], oz['Cow'/122, l='MpServer', x=32.09, y=63.00, z=286.41], oz['Cow'/121, l='MpServer', x=35.81, y=63.00, z=275.15], pd['Pig'/120, l='MpServer', x=33.20, y=63.00, z=286.25]]
Retry entities: 0 total; []
Stacktrace:
at ayp.a(SourceFile:281)
at net.minecraft.client.Minecraft.b(SourceFile:1871)
at net.minecraft.client.Minecraft.run(SourceFile:548)
at java.lang.Thread.run(Unknown Source)
-- System Details --
Details:
Minecraft Version: 1.4.7
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_15, Oracle Corporation
Java VM Version: Java HotSpot™ Client VM (mixed mode), Oracle Corporation
Memory: 295241512 bytes (281 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 7955 (445480 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
LWJGL: 2.4.2
OpenGL: Quadro FX 1700/PCIe/SSE2 GL version 3.3.0, NVIDIA Corporation
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 2983 (167048 bytes; 0 MB) allocated, 25 (1400 bytes; 0 MB) used