I have a bad error here is what it says ---- Minecraft Crash Report ----
// Don't do that.

Time: 12/19/14 3:45 PM
Description: Starting integrated server

java.lang.ExceptionInInitializerError
at net.minecraft.server.MinecraftServer.<init>(Minecr aftServer.java:173)
at net.minecraft.server.integrated.IntegratedServer.< init>(IntegratedServer.java:40)
at net.minecraft.client.Minecraft.launchIntegratedSer ver(Minecraft.java:2160)
at net.minecraft.client.gui.GuiCreateWorld.actionPerf ormed(GuiCreateWorld.java:234)
at net.minecraft.client.gui.GuiScreen.mouseClicked(Gu iScreen.java:241)
at net.minecraft.client.gui.GuiCreateWorld.mouseClick ed(GuiCreateWorld.java:387)
at net.minecraft.client.gui.GuiScreen.handleMouseInpu t(GuiScreen.java:324)
at net.minecraft.client.gui.GuiScreen.handleInput(Gui Screen.java:288)
at net.minecraft.client.Minecraft.runTick(Minecraft.j ava:1683)
at net.minecraft.client.Minecraft.runGameLoop(Minecra ft.java:996)
at net.minecraft.client.Minecraft.run(Minecraft.java: 911)
at net.minecraft.client.main.Main.main(Main.java:109)
at Start.main(Start.java:11)
Caused by: java.lang.IllegalStateException: failed to create a child event loop
at io.netty.util.concurrent.MultithreadEventExecutorG roup.<init>(MultithreadEventExecutorGroup.java:61)
at io.netty.channel.MultithreadEventLoopGroup.<init>( MultithreadEventLoopGroup.java:49)
at io.netty.channel.nio.NioEventLoopGroup.<init>(NioE ventLoopGroup.java:61)
at io.netty.channel.nio.NioEventLoopGroup.<init>(NioE ventLoopGroup.java:52)
at net.minecraft.network.NetworkSystem.<clinit>(Netwo rkSystem.java:43)
... 13 more
Caused by: io.netty.channel.ChannelException: failed to open a new selector
at io.netty.channel.nio.NioEventLoop.openSelector(Nio EventLoop.java:128)
at io.netty.channel.nio.NioEventLoop.<init>(NioEventL oop.java:120)
at io.netty.channel.nio.NioEventLoopGroup.newChild(Ni oEventLoopGroup.java:87)
at io.netty.util.concurrent.MultithreadEventExecutorG roup.<init>(MultithreadEventExecutorGroup.java:57)
... 17 more
Caused by: java********Exception: Unable to establish loopback connection
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java: 125)
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java: 69)
at java.security.AccessController.doPrivileged(Native Method)
at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:141)
at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorP roviderImpl.java:50)
at java.nio.channels.Pipe.open(Pipe.java:150)
at sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelec torImpl.java:126)
at sun.nio.ch.WindowsSelectorProvider.openSelector(Wi ndowsSelectorProvider.java:44)
at io.netty.channel.nio.NioEventLoop.openSelector(Nio EventLoop.java:126)
... 20 more
Caused by: java.net.ConnectException: Connection timed out: connect
at sun.nio.ch.Net.connect0(Native Method)
at sun.nio.ch.Net.connect(Net.java:364)
at sun.nio.ch.Net.connect(Net.java:356)
at sun.nio.ch.SocketChannelImpl.connect(SocketChannel Impl.java:623)
at java.nio.channels.SocketChannel.open(SocketChannel .java:184)
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java: 97)
... 28 more


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

-- Head --
Stacktrace:
at net.minecraft.server.MinecraftServer.<init>(Minecr aftServer.java:173)
at net.minecraft.server.integrated.IntegratedServer.< init>(IntegratedServer.java:40)

-- Starting integrated server --
Details:
Level ID: New World-
Level Name: New World
Stacktrace:
at net.minecraft.client.Minecraft.launchIntegratedSer ver(Minecraft.java:2160)
at net.minecraft.client.gui.GuiCreateWorld.actionPerf ormed(GuiCreateWorld.java:234)
at net.minecraft.client.gui.GuiScreen.mouseClicked(Gu iScreen.java:241)
at net.minecraft.client.gui.GuiCreateWorld.mouseClick ed(GuiCreateWorld.java:387)
at net.minecraft.client.gui.GuiScreen.handleMouseInpu t(GuiScreen.java:324)
at net.minecraft.client.gui.GuiScreen.handleInput(Gui Screen.java:288)

-- Affected screen --
Details:
Screen name: net.minecraft.client.gui.GuiMainMenu
Stacktrace:
at net.minecraft.client.Minecraft.runTick(Minecraft.j ava:1683)
at net.minecraft.client.Minecraft.runGameLoop(Minecra ft.java:996)
at net.minecraft.client.Minecraft.run(Minecraft.java: 911)
at net.minecraft.client.main.Main.main(Main.java:109)
at Start.main(Start.java:11)

-- System Details --
Details:
Minecraft Version: 1.7.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_21, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1022632352 bytes (975 MB) / 1056309248 bytes (1007 MB) up to 1056309248 bytes (1007 MB)
JVM Flags: 3 total; -Xincgc -Xmx1024M -Xms1024M
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: mcp
LWJGL: 2.9.0
OpenGL: Intel Bear Lake B GL version 1.4.0 - Build 8.14.10.1930, Intel
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: Off (1).



also it only crashes when I try and make a world!!!!!