description of the error
--- Minecraft Crash Report ----
// Oh - I know what I did wrong!

Time: 28.10.13 19:52
Description: Starting integrated server

java.lang.ExceptionInInitializerError
    at net.minecraft.server.MinecraftServer.<init>(SourceFile:114)
    at bsk.<init>(SourceFile:38)
    at azd.a(SourceFile:1591)
    at bbi.a(SourceFile:202)
    at bcd.a(SourceFile:172)
    at bbi.a(SourceFile:301)
    at bcd.d(SourceFile:236)
    at bcd.k(SourceFile:211)
    at azd.o(SourceFile:1303)
    at azd.ad(SourceFile:753)
    at azd.e(SourceFile:704)
    at net.minecraft.client.main.Main.main(SourceFile:103)
Caused by: java.lang.IllegalStateException: failed to create a child event loop
    at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:61)
    at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:49)
    at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:61)
    at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:52)
    at ms.<clinit>(SourceFile:31)
    ... 12 more
Caused by: io.netty.channel.ChannelException: failed to open a new selector
    at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:128)
    at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:120)
    at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:87)
    at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:57)
    ... 16 more
Caused by: java.io.IOException: Unable to establish loopback connection
    at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source)
    at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.nio.ch.PipeImpl.<init>(Unknown Source)
    at sun.nio.ch.SelectorProviderImpl.openPipe(Unknown Source)
    at java.nio.channels.Pipe.open(Unknown Source)
    at sun.nio.ch.WindowsSelectorImpl.<init>(Unknown Source)
    at sun.nio.ch.WindowsSelectorProvider.openSelector(Unknown Source)
    at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:126)
    ... 19 more
Caused by: java.net.ConnectException: Connection refused: connect
    at sun.nio.ch.Net.connect0(Native Method)
    at sun.nio.ch.Net.connect(Unknown Source)
    at sun.nio.ch.Net.connect(Unknown Source)
    at sun.nio.ch.SocketChannelImpl.connect(Unknown Source)
    at java.nio.channels.SocketChannel.open(Unknown Source)
    ... 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>(SourceFile:114)
    at bsk.<init>(SourceFile:38)

-- Starting integrated server --
Details:
    Level ID: New World-
    Level Name: New World
Stacktrace:
    at azd.a(SourceFile:1591)
    at bbi.a(SourceFile:202)
    at bcd.a(SourceFile:172)
    at bbi.a(SourceFile:301)
    at bcd.d(SourceFile:236)
    at bcd.k(SourceFile:211)

-- Affected screen --
Details:
    Screen name: btj
Stacktrace:
    at azd.o(SourceFile:1303)
    at azd.ad(SourceFile:753)
    at azd.e(SourceFile:704)
    at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
    Minecraft Version: 1.7.2
    Operating System: Windows 7 (amd64) version 6.1
    Java Version: 1.7.0_25, Oracle Corporation
    Java VM Version: Java HotSpot™ 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 116304744 bytes (110 MB) / 151781376 bytes (144 MB) up to 954466304 bytes (910 MB)
    JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
    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: 1.7.2
    LWJGL: 2.9.0
    OpenGL: GeForce GT 240M/PCIe/SSE2 GL version 3.3.0, NVIDIA Corporation
    Is Modded: Probably not. Jar signature remains and client brand is untouched.
    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)