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I get this bug crash! help!

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 8/29/14 6:55 PM
Description: Updating screen events

java.lang.NoSuchMethodError: com.mojang.authlib.GameProfile.<init>(Ljava/lang/String;Ljava/lang/String;)V
at net.minecraft.util.Session.func_148256_e(Session.java:41)
at net.minecraft.client.Minecraft.launchIntegratedServer(Minecraft.java:2136)
at net.minecraft.client.gui.GuiSelectWorld.func_146615_e(GuiSelectWorld.java:182)
at net.minecraft.client.gui.GuiSelectWorld.actionPerformed(GuiSelectWorld.java:129)​
at net.minecraft.client.gui.GuiScreen.mouseClicked(GuiScreen.java:241)
at net.minecraft.client.gui.GuiScreen.handleMouseInput(GuiScreen.java:324)
at net.minecraft.client.gui.GuiScreen.handleInput(GuiScreen.java:288)
at net.minecraft.client.Minecraft.runTick(Minecraft.java:1635)
at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:947)
at net.minecraft.client.Minecraft.run(Minecraft.java:863)
at net.minecraft.client.main.Main.main(Main.java:109)


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

-- Head --
Stacktrace:
at net.minecraft.util.Session.func_148256_e(Session.java:41)
at net.minecraft.client.Minecraft.launchIntegratedServer(Minecraft.java:2136)
at net.minecraft.client.gui.GuiSelectWorld.func_146615_e(GuiSelectWorld.java:182)
at net.minecraft.client.gui.GuiSelectWorld.actionPerformed(GuiSelectWorld.java:129)​
at net.minecraft.client.gui.GuiScreen.mouseClicked(GuiScreen.java:241)
at net.minecraft.client.gui.GuiScreen.handleMouseInput(GuiScreen.java:324)
at net.minecraft.client.gui.GuiScreen.handleInput(GuiScreen.java:288)

-- Affected screen --
Details:
Screen name: net.minecraft.client.gui.GuiMainMenu
Stacktrace:
at net.minecraft.client.Minecraft.runTick(Minecraft.java:1635)
at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:947)
at net.minecraft.client.Minecraft.run(Minecraft.java:863)
at net.minecraft.client.main.Main.main(Main.java:109)

-- System Details --
Details:
Minecraft Version: 1.7.2
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_20, Oracle Corporation
Java VM Version: Java HotSpot™ 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 109025632 bytes (103 MB) / 205758464 bytes (196 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.h​eapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: Stamina
LWJGL: 2.9.1
OpenGL: GeForce GTX 745/PCIe/SSE2 GL version 4.4.0, NVIDIA Corporation
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Resource Packs: [§B§cL2GetGood]
Current Language: ~~ERROR~~ NullPointerException: null
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null
Anisotropic Filtering: Off (1)

May have to do with the use of Java 1.8. It's not fully supported yet. But, this may have nothing to do with your error. Sorry if that's the case.

I fixed.

If you are going to use Java 1.7, you can't code in a Java 1.8 format. Use the 1.7 src.

I fixed.

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