minecraft: Chyba v Minecraftu

Ahoj poradíte mi? zapnu normálně mc přes launcher ale nenačítají se mi servery.. a když dám vytvořit nový svět v singlu tak se vypne hra a napíše se tohle :
"--- Minecraft Crash Report ----
// Don't do that.

Time: 12.7.14 0:34
Description: Starting integrated server

java.lang.ExceptionInInitializerError
at net.minecraft.server.MinecraftServer.(SourceFile:120)
at bsx.(SourceFile:38)
at bao.a(SourceFile:1610)
at bdb.a(SourceFile:202)
at bdw.a(SourceFile:172)
at bdb.a(SourceFile:301)
at bdw.k(SourceFile:232)
at bdw.p(SourceFile:211)
at bao.p(SourceFile:1328)
at bao.ak(SourceFile:774)
at bao.f(SourceFile:728)
at net.minecraft.client.main.Main.main(SourceFile:148)
Caused by: java.lang.IllegalStateException: failed to create a child event loop
at io.netty.util.concurrent.MultithreadEventExecutorGroup.(MultithreadEventExecutorGroup.java:61)
at io.netty.channel.MultithreadEventLoopGroup.(MultithreadEventLoopGroup.java:49)
at io.netty.channel.nio.NioEventLoopGroup.(NioEventLoopGroup.java:61)
at io.netty.channel.nio.NioEventLoopGroup.(NioEventLoopGroup.java:52)
at nc.(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.(NioEventLoop.java:120)
at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:87)
at io.netty.util.concurrent.MultithreadEventExecutorGroup.(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 java.security.AccessController.doPrivileged(Native Method)
at sun.nio.ch.PipeImpl.(Unknown Source)
at sun.nio.ch.SelectorProviderImpl.openPipe(Unknown Source)
at java.nio.channels.Pipe.open(Unknown Source)
at sun.nio.ch.WindowsSelectorImpl.(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.connect(Native Method)
at sun.nio.ch.SocketChannelImpl.connect(Unknown Source)
at java.nio.channels.SocketChannel.open(Unknown Source)
... 27 more