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java.lang.IllegalStateException: channel not registered to an event loop at io.netty.channel.AbstractChannel.eventLoop(AbstractChannel.java:116)[69:io.netty.transport:4.0.37.Final] at io.netty.channel.epoll.AbstractEpollChannel.doDeregister(AbstractEpollChannel.java:132)[73:io.netty.transport-native-epoll:4.0.37.Final] at io.netty.channel.epoll.AbstractEpollChannel.doClose(AbstractEpollChannel.java:109)[73:io.netty.transport-native-epoll:4.0.37.Final] at io.netty.channel.AbstractChannel$AbstractUnsafe.closeForcibly(AbstractChannel.java:638)[69:io.netty.transport:4.0.37.Final] at io.netty.bootstrap.AbstractBootstrap.initAndRegister(AbstractBootstrap.java:312)[69:io.netty.transport:4.0.37.Final] at io.netty.bootstrap.AbstractBootstrap.doBind(AbstractBootstrap.java:272)[69:io.netty.transport:4.0.37.Final] at io.netty.bootstrap.AbstractBootstrap.bind(AbstractBootstrap.java:268)[69:io.netty.transport:4.0.37.Final] at io.netty.bootstrap.AbstractBootstrap.bind(AbstractBootstrap.java:257)[69:io.netty.transport:4.0.37.Final]