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org.java_websocket.exceptions.WebsocketNotConnectedException: 	at org.java_websocket.WebSocketImpl.send(WebSocketImpl.java:566)	at org.java_websocket.WebSocketImpl.send(WebSocketImpl.java:543)	at org.java_websocket.client.WebSocketClient.send(WebSocketClient.java:171)	at com.github.nkzawa.engineio.client.transports.WebSocket$2.call(WebSocket.java:114)	at com.github.nkzawa.engineio.parser.Parser.encodePacket(Parser.java:63)	at com.github.nkzawa.engineio.parser.Parser.encodePacket(Parser.java:42)	at com.github.nkzawa.engineio.client.transports.WebSocket.write(WebSocket.java:110)	at com.github.nkzawa.engineio.client.Transport$3.run(Transport.java:98)	at com.github.nkzawa.thread.EventThread.exec(EventThread.java:50)	at com.github.nkzawa.engineio.client.Transport.send(Transport.java:94)	at com.github.nkzawa.engineio.client.Socket$7.call(Socket.java:317)	at com.github.nkzawa.emitter.Emitter$OnceListener.call(Emitter.java:164)	at com.github.nkzawa.emitter.Emitter.emit(Emitter.java:117)	at com.github.nkzawa.engineio.client.Transport.onOpen(Transport.java:109)	at com.github.nkzawa.engineio.client.transports.WebSocket.access$000(WebSocket.java:19)	at com.github.nkzawa.engineio.client.transports.WebSocket$1$1.run(WebSocket.java:56)	at com.github.nkzawa.thread.EventThread$2.run(EventThread.java:75)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)	at java.lang.Thread.run(Thread.java:818)