java.lang.IllegalStateException: failed to create a child event loop

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java.lang.IllegalStateException: failed to create a child event loop
at sun.nio.ch.Net.socket0(Native Method)
at sun.nio.ch.Net.serverSocket(Unknown Source)
at sun.nio.ch.ServerSocketChannelImpl.(Unknown Source)
at sun.nio.ch.SelectorProviderImpl.openServerSocketChannel(Unknown Source)
at java.nio.channels.ServerSocketChannel.open(Unknown Source)
at sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(Unknown Source)
at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source)
at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.nio.ch.PipeImpl.(Unknown Source)
at sun.nio.ch.SelectorProviderImpl.openPipe(Unknown Source)
at java.nio.channels.Pipe.open(Unknown Source)
at sun.nio.ch.WindowsSelectorImpl.(Unknown Source)
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:126)
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:64)
at io.netty.channel.MultithreadEventLoopGroup.(MultithreadEventLoopGroup.java:49)
at io.netty.channel.nio.NioEventLoopGroup.(NioEventLoopGroup.java:61)
at io.netty.channel.nio.NioEventLoopGroup.(NioEventLoopGroup.java:52)
at undefined.re.a(SourceFile:44)
at undefined.re.b(SourceFile:41)
at undefined.ur.c(SourceFile:10)
at undefined.rd.a(SourceFile:121)
at undefined.bss.a(SourceFile:1923)
at undefined.bwd.a(SourceFile:210)
at undefined.bxe.a(SourceFile:342)
at undefined.bwd.a(SourceFile:350)
at undefined.bxe.k(SourceFile:405)
at undefined.bxe.p(SourceFile:382)
at undefined.bss.r(SourceFile:1480)
at undefined.bss.at(SourceFile:880)
at undefined.bss.a(SourceFile:317)

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