crash flex gui

---- Minecraft Crash Report ----
// Everything's going to plan. No, really, that was supposed to happen.

Time: 2/22/14 6:16 PM
Description: Initializing game

java.lang.VerifyError: Bad type on operand stack
Exception Details:
  Location:
    bah.a(Laym;IILbag;)V @94: invokestatic
  Reason:
    Type 'ayn' (current frame, stack[1]) is not assignable to 'ayt'
  Current Frame:
    bci: @94
    flags: { }
    locals: { 'bah', 'aym', integer, integer, 'bag', 'ayr', 'java/util/Collection', integer, top, 'java/util/Iterator', 'ayo', 'ayn' }
    stack: { 'java/lang/StringBuilder', 'ayn', 'java/lang/String' }
  Bytecode:
    0000000: 2bb6 0284 3a05 1905 2bb6 02d6 3a06 1906
    0000010: b902 d901 0010 0fa3 01ae 1904 2bb6 02db
    0000020: b601 3836 0719 06b9 02df 0100 3a09 1909
    0000030: b902 e401 0099 0059 1909 b902 e801 00c0
    0000040: 0290 3a0a 1905 190a b602 eab6 027d 3a0b
    0000050: bb00 c359 b700 c419 0b19 0ab6 02ea b802
    0000060: 82b6 00ca 1302 ecb6 00ca b202 eeb6 028e
    0000070: 190a b602 92b6 0135 b600 d93a 0815 0719
    0000080: 0419 08b6 0138 b802 f336 07a7 ffa3 1906
    0000090: b902 d901 0019 04b4 02f5 6836 091c 056c
    00000a0: 1509 066c 6036 0a06 360b 1d15 0764 150b
    00000b0: 6436 0c03 360d 1906 b902 df01 003a 0e19
    00000c0: 0eb9 02e4 0100 9900 ff19 0eb9 02e8 0100
    00000d0: c002 903a 0f84 0d01 1905 190f b602 eab6
    00000e0: 027d 3a10 1910 190f b602 eab8 0282 3a11
    00000f0: bb00 c359 b700 c4b2 02ee b602 8e12 2db6
    0000100: 00ca 190f b602 92b6 0135 b600 d93a 1215
    0000110: 0a15 0d19 04b4 02f5 6864 3613 1d15 0b64
    0000120: 0560 3614 150c 0564 1513 1514 1513 1904
    0000130: b402 f560 1302 f6b8 011a 1904 1911 150c
    0000140: 1513 1302 72b6 013b 5719 0419 1215 1419
    0000150: 0419 12b6 0138 6415 1313 0272 b601 3b57
    0000160: 150d 1906 b902 d901 00a0 0059 2bb6 02db
    0000170: 3a15 150c 0564 1513 1904 b402 f564 0464
    0000180: 1514 1513 0464 1302 f7b8 011a 150c 0564
    0000190: 1513 0464 1514 1513 1302 f6b8 011a 1904
    00001a0: 1915 150c 1507 056c 6019 0419 15b6 0138
    00001b0: 056c 6415 1319 04b4 02f5 6413 0272 b601
    00001c0: 3b57 a7fe fdb1
  Stackmap Table:
    full_frame(@46,{Object[#2],Object[#592],Integer,Integer,Object[#117],Object[#584],Object[#728],Integer,Top,Object[#737]},{})
    chop_frame(@142,2)
    full_frame(@191,{Object[#2],Object[#592],Integer,Integer,Object[#117],Object[#584],Object[#728],Integer,Top,Integer,Integer,Integer,Integer,Integer,Object[#737]},{})
    same_frame_extended(@450)
    full_frame(@453,{Object[#2],Object[#592],Integer,Integer,Object[#117],Object[#584],Object[#728]},{})

	at azi.ad(SourceFile:442)
	at azi.f(SourceFile:696)
	at net.minecraft.client.main.Main.main(SourceFile:152)
	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 magic.launcher.Launcher.main(SourceFile:207)


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

-- Head --
Stacktrace:
	at azi.ad(SourceFile:442)

-- Initialization --
Details:
Stacktrace:
	at azi.f(SourceFile:696)
	at net.minecraft.client.main.Main.main(SourceFile:152)
	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 magic.launcher.Launcher.main(SourceFile:207)

-- System Details --
Details:
	Minecraft Version: 1.7.4
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_40, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 1790986888 bytes (1708 MB) / 2058878976 bytes (1963 MB) up to 2058878976 bytes (1963 MB)
	JVM Flags: 3 total; -Xms2048m -Xmx2048m -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.7.4
	LWJGL: 2.9.1
	OpenGL: GeForce GTX 460 v2/PCIe/SSE2 GL version 4.4.0, NVIDIA Corporation
	GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

	Is Modded: Very likely; Jar signature invalidated
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null
	Anisotropic Filtering: On (2)