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We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search 	at	at	at	at	at	at io.netty.util.NetUtil.(	at io.netty.util.internal.MacAddressUtil.bestAvailableMac(	at	at	at	at	at	at	at	at	at java.lang.Class.newInstanceImpl(Native Method)	at java.lang.Class.newInstance(	at	at io.netty.bootstrap.AbstractBootstrap.initAndRegister(	at io.netty.bootstrap.AbstractBootstrap.doBind(	at io.netty.bootstrap.AbstractBootstrap.bind(	at io.netty.bootstrap.AbstractBootstrap.bind(