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java.lang.NullPointerException: 	at com.haniokasai.nukkit.MyAuth.Main.join(Main.java:47)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at cn.nukkit.plugin.MethodEventExecutor.execute(MethodEventExecutor.java:25)	at cn.nukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:51)	at cn.nukkit.plugin.PluginManager.callEvent(PluginManager.java:568)	at cn.nukkit.Player.doFirstSpawn(Player.java:696)	at cn.nukkit.Player.sendNextChunk(Player.java:647)	at cn.nukkit.Player.checkNetwork(Player.java:1529)	at cn.nukkit.Server.tick(Server.java:994)	at cn.nukkit.Server.tickProcessor(Server.java:781)	at cn.nukkit.Server.start(Server.java:761)	at cn.nukkit.Server.(Server.java:455)	at cn.nukkit.Nukkit.main(Nukkit.java:65)