java.lang.IncompatibleClassChangeError: interface not implemented

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java.lang.IncompatibleClassChangeError: interface not implemented
at org.jboss.netty.util.HashedWheelTimer$Worker.fetchExpiredTimeouts(HashedWheelTimer.java)
at org.jboss.netty.util.HashedWheelTimer$Worker.fetchExpiredTimeouts(HashedWheelTimer.java)
at org.jboss.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:368)
at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)

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