[13:48:51] [Netty Server IO #0/ERROR] [FML]: NetworkDispatcher exception
java.io.IOException: An established connection was aborted by the software in your host machine
        at sun.nio.ch.SocketDispatcher.write0(Native Method) ~[?:1.8.0_211]
        at sun.nio.ch.SocketDispatcher.write(Unknown Source) ~[?:1.8.0_211]
        at sun.nio.ch.IOUtil.writeFromNativeBuffer(Unknown Source) ~[?:1.8.0_211]
        at sun.nio.ch.IOUtil.write(Unknown Source) ~[?:1.8.0_211]
        at sun.nio.ch.SocketChannelImpl.write(Unknown Source) ~[?:1.8.0_211]
        at io.netty.channel.socket.nio.NioSocketChannel.doWrite(NioSocketChannel.java:417) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannel$AbstractUnsafe.flush0(AbstractChannel.java:856) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.flush0(AbstractNioChannel.java:362) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannel$AbstractUnsafe.flush(AbstractChannel.java:823) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.DefaultChannelPipeline$HeadContext.flush(DefaultChannelPipeline.java:1296) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.ChannelDuplexHandler.flush(ChannelDuplexHandler.java:117) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) ~[minecraft_server.1.12.2.jar:?]
        at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.flush(NetworkDispatcher.java:555) ~[NetworkDispatcher.class:?]
        at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:802) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:814) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:794) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:831) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1032) ~[minecraft_server.1.12.2.jar:?]
        at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:296) ~[minecraft_server.1.12.2.jar:?]
        at net.minecraft.network.NetworkManager$4.run(NetworkManager.java:245) [gw$4.class:?]
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163) [minecraft_server.1.12.2.jar:?]
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:403) [minecraft_server.1.12.2.jar:?]
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:442) [minecraft_server.1.12.2.jar:?]
        at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858) [minecraft_server.1.12.2.jar:?]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_211]
[13:48:51] [Server thread/INFO] [minecraft/NetHandlerPlayServer]: playername3 lost connection: Disconnected
[13:48:51] [Server thread/INFO] [minecraft/DedicatedServer]: playername3 left the game