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.ExceptionInInitializerError	at bbf.run(SourceFile:55)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 ef.<clinit>(SourceFile:41)	... 1 more