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failed to create a child event loop
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failed to create a child event loop
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failed to create a child event loop
io.netty.channel.ChannelException: failed to open a new selector	at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:128)	at io.netty.channel.nio.NioEventLoop.(NioEventLoop.java:120)	at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:87)	at io.netty.util.concurrent.MultithreadEventExecutorGroup.(MultithreadEventExecutorGroup.java:57)