java.lang.ExceptionInInitializerError: This exception has no message.

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Can't connect to minecraft servers after 1.7.2 update

This exception has no message.

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 ef.(SourceFile:41)	at bbf.run(SourceFile:55)