java.lang.ClassFormatError: Unknown constant tag 118 in class file sun/nio/cs/ISO_8859_1$Encoder
	at sun.nio.cs.ISO_8859_1.newEncoder(Unknown Source)
	at org.lwjgl.MemoryUtil.encode(MemoryUtil.java:253)
	at org.lwjgl.MemoryUtil.encode(MemoryUtil.java:243)
	at org.lwjgl.MemoryUtil.encodeASCII(MemoryUtil.java:202)
	at org.lwjgl.opengl.GLContext.getFunctionAddress(GLContext.java:213)
	at org.lwjgl.opengl.ContextCapabilities.initAllStubs(ContextCapabilities.java:5280)
	at org.lwjgl.opengl.ContextCapabilities.<init>(ContextCapabilities.java:5686)
	at org.lwjgl.opengl.GLContext.useContext(GLContext.java:374)
	at org.lwjgl.opengl.ContextGL.makeCurrent(ContextGL.java:195)
	at org.lwjgl.opengl.DrawableGL.makeCurrent(DrawableGL.java:110)
	at org.lwjgl.opengl.Display.makeCurrent(Display.java:706)
	at org.lwjgl.opengl.Display.makeCurrentAndSetSwapInterval(Display.java:1025)
	at org.lwjgl.opengl.Display.create(Display.java:852)
	at org.lwjgl.opengl.Display.create(Display.java:757)
	at ats.O(SourceFile:284)

---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 05/08/13 16:37
Description: Initializing game

java.lang.ClassFormatError: Unknown constant tag 118 in class file sun/nio/cs/ISO_8859_1$Encoder
	at sun.nio.cs.ISO_8859_1.newEncoder(Unknown Source)
	at org.lwjgl.MemoryUtil.encode(MemoryUtil.java:253)
	at org.lwjgl.MemoryUtil.encode(MemoryUtil.java:243)
	at org.lwjgl.MemoryUtil.encodeASCII(MemoryUtil.java:202)
	at org.lwjgl.opengl.GLContext.getFunctionAddress(GLContext.java:213)
	at org.lwjgl.opengl.ContextCapabilities.initAllStubs(ContextCapabilities.java:5280)
	at org.lwjgl.opengl.ContextCapabilities.<init>(ContextCapabilities.java:5686)
	at org.lwjgl.opengl.GLContext.useContext(GLContext.java:374)
	at org.lwjgl.opengl.ContextGL.makeCurrent(ContextGL.java:195)
	at org.lwjgl.opengl.DrawableGL.makeCurrent(DrawableGL.java:110)
	at org.lwjgl.opengl.Display.makeCurrent(Display.java:706)
	at org.lwjgl.opengl.Display.makeCurrentAndSetSwapInterval(Display.java:1025)
	at org.lwjgl.opengl.Display.create(Display.java:852)
	at org.lwjgl.opengl.Display.create(Display.java:757)
	at ats.O(SourceFile:284)
	at ats.d(SourceFile:599)
	at net.minecraft.client.main.Main.main(SourceFile:101)


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

-- Head --
Stacktrace:
	at sun.nio.cs.ISO_8859_1.newEncoder(Unknown Source)
	at org.lwjgl.MemoryUtil.encode(MemoryUtil.java:253)
	at org.lwjgl.MemoryUtil.encode(MemoryUtil.java:243)
	at org.lwjgl.MemoryUtil.encodeASCII(MemoryUtil.java:202)
	at org.lwjgl.opengl.GLContext.getFunctionAddress(GLContext.java:213)
	at org.lwjgl.opengl.ContextCapabilities.initAllStubs(ContextCapabilities.java:5280)
	at org.lwjgl.opengl.ContextCapabilities.<init>(ContextCapabilities.java:5686)
	at org.lwjgl.opengl.GLContext.useContext(GLContext.java:374)
	at org.lwjgl.opengl.ContextGL.makeCurrent(ContextGL.java:195)
	at org.lwjgl.opengl.DrawableGL.makeCurrent(DrawableGL.java:110)
	at org.lwjgl.opengl.Display.makeCurrent(Display.java:706)
	at org.lwjgl.opengl.Display.makeCurrentAndSetSwapInterval(Display.java:1025)
	at org.lwjgl.opengl.Display.create(Display.java:852)
	at org.lwjgl.opengl.Display.create(Display.java:757)
	at ats.O(SourceFile:284)

-- Initialization --
Details:
Stacktrace:
	at ats.d(SourceFile:599)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.2
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 5146168 bytes (4 MB) / 26808320 bytes (25 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: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.6.2
	LWJGL: 2.9.0
	OpenGL: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Default
	Current Language: ~~ERROR~~ NullPointerException: null
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null