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java.lang.NullPointerException: 	at io.netty.channel.group.DefaultChannelGroup.add(DefaultChannelGroup.java:146)	at play.core.server.NettyServer.bind(NettyServer.scala:140)	at play.core.server.NettyServer.play$core$server$NettyServer$$bindChannel(NettyServer.scala:224)	at play.core.server.NettyServer$$anonfun$1.apply(NettyServer.scala:216)	at play.core.server.NettyServer$$anonfun$1.apply(NettyServer.scala:216)	at scala.Option.map(Option.scala:146)	at play.core.server.NettyServer.(NettyServer.scala:216)	at play.core.server.NettyServerProvider.createServer(NettyServer.scala:279)	at play.core.server.NettyServerProvider.createServer(NettyServer.scala:278)	at play.core.server.DevServerStart$$anonfun$mainDev$1.apply(DevServerStart.scala:235)	at play.core.server.DevServerStart$$anonfun$mainDev$1.apply(DevServerStart.scala:65)	at play.utils.Threads$.withContextClassLoader(Threads.scala:21)	at play.core.server.DevServerStart$.mainDev(DevServerStart.scala:64)	at play.core.server.DevServerStart$.mainDevHttpMode(DevServerStart.scala:54)	at play.core.server.DevServerStart.mainDevHttpMode(DevServerStart.scala)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at play.runsupport.Reloader$.startDevMode(Reloader.scala:234)	at play.sbt.run.PlayRun$$anonfun$playRunTask$1$$anonfun$apply$2$$anonfun$apply$3.devModeServer$lzycompute$1(PlayRun.scala:74)	at play.sbt.run.PlayRun$$anonfun$playRunTask$1$$anonfun$apply$2$$anonfun$apply$3.play$sbt$run$PlayRun$$anonfun$$anonfun$$anonfun$$devModeServer$1(PlayRun.scala:74)	at play.sbt.run.PlayRun$$anonfun$playRunTask$1$$anonfun$apply$2$$anonfun$apply$3.apply(PlayRun.scala:100)	at play.sbt.run.PlayRun$$anonfun$playRunTask$1$$anonfun$apply$2$$anonfun$apply$3.apply(PlayRun.scala:53)	at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)