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HELP

whenever i try to use for it crashes and comes up with this error

here is the report

 

 

---- Minecraft Crash Report ----
// Don't do that.

Time: 11/12/13 4:39 PM
Description: Initializing game

java.lang.SecurityException: SHA1 digest error for assets/minecraft/texts/splashes.txt
   at sun.security.util.ManifestEntryVerifier.verify(Unknown Source)
   at java.util.jar.JarVerifier.processEntry(Unknown Source)
   at java.util.jar.JarVerifier.update(Unknown Source)
   at java.util.jar.JarVerifier$VerifierStream.read(Unknown Source)
   at java.io.FilterInputStream.read(Unknown Source)
   at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
   at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
   at sun.nio.cs.StreamDecoder.read(Unknown Source)
   at java.io.InputStreamReader.read(Unknown Source)
   at java.io.BufferedReader.fill(Unknown Source)
   at java.io.BufferedReader.readLine(Unknown Source)
   at java.io.BufferedReader.readLine(Unknown Source)
   at net.minecraft.client.gui.GuiMainMenu.<init>(GuiMainMenu.java:89)
   at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:517)
   at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:806)
   at net.minecraft.client.main.Main.main(SourceFile:101)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
   at net.minecraft.launchwrapper.Launch.main(Launch.java:27)


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

-- Head --
Stacktrace:
   at sun.security.util.ManifestEntryVerifier.verify(Unknown Source)
   at java.util.jar.JarVerifier.processEntry(Unknown Source)
   at java.util.jar.JarVerifier.update(Unknown Source)
   at java.util.jar.JarVerifier$VerifierStream.read(Unknown Source)
   at java.io.FilterInputStream.read(Unknown Source)
   at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
   at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
   at sun.nio.cs.StreamDecoder.read(Unknown Source)
   at java.io.InputStreamReader.read(Unknown Source)
   at java.io.BufferedReader.fill(Unknown Source)
   at java.io.BufferedReader.readLine(Unknown Source)
   at java.io.BufferedReader.readLine(Unknown Source)
   at net.minecraft.client.gui.GuiMainMenu.<init>(GuiMainMenu.java:89)
   at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:517)

-- Initialization --
Details:
Stacktrace:
   at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:806)
   at net.minecraft.client.main.Main.main(SourceFile:101)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
   at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

-- System Details --
Details:
   Minecraft Version: 1.6.4
   Operating System: Windows 7 (x86) version 6.1
   Java Version: 1.7.0_45, Oracle Corporation
   Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
   Memory: 43424624 bytes (41 MB) / 105607168 bytes (100 MB) up to 518979584 bytes (494 MB)
   JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
   AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
   Suspicious classes: FML and Forge are installed
   IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
   FML: MCP v8.11 FML v6.4.8.886 Minecraft Forge 9.11.0.886 3 mods loaded, 3 mods active
   mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
   FML{6.4.8.886} [Forge Mod Loader] (minecraftforge-9.11.0.886.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
   Forge{9.11.0.886} [Minecraft Forge] (minecraftforge-9.11.0.886.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
   Launched Version: 1.6.4-Forge9.11.0.886
   LWJGL: 2.9.0
   OpenGL: Intel(R) HD Graphics Family GL version 3.1.0 - Build 8.15.10.2418, Intel
   Is Modded: Definitely; Client brand changed to 'fml,forge'
   Type: Client (map_client.txt)
   Resource Pack: Default
   Current Language: English (US)
   Profiler Position: N/A (disabled)
   Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

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