Hello,

I launch the game Minecraft in version 1.16.1, I am in the menu of Minecraft then I create a map and I launch the MAP Minecraft then after 100%, it returns to the launcher with a word or message. here are the words: "The game crashed whilst mouseclicked event handler
Error: java.lang.IllegalStateException: failed to create a child event loop "

I give you the report.

I have a GTX 1080 Graphics card with an i7-7820HK processor and 32 GB of RAM with Windows 10

---------------Voici le Rapport------------------------------------

---- Minecraft Crash Report -------- Minecraft Crash Report ----// You're mean.
Time: 15/07/20 16:10Description: mouseClicked event handler
java.lang.IllegalStateException: failed to create a child event loop at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:88) at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:58) at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:47) at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:59) at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:77) at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:72) at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:59) at zu.f(SourceFile:54) at zu$$Lambda$3870/1734164240.get(Unknown Source) at ady.a(SourceFile:16) at zu.a(SourceFile:135) at dlx.a(SourceFile:1837) at dlx.a(SourceFile:1702) at dty.n(SourceFile:287) at dty.b(SourceFile:226) at dty$$Lambda$3119/1501535645.onPress(Unknown Source) at dni.b(SourceFile:33) at dnc.a(SourceFile:16) at dng.a(SourceFile:149) at doe.a(SourceFile:27) at dly.b(SourceFile:92) at dly$$Lambda$2908/1610659945.run(Unknown Source) at dqs.a(SourceFile:431) at dly.a(SourceFile:92) at dly.c(SourceFile:162) at dly$$Lambda$2907/743109550.run(Unknown Source) at amn.execute(SourceFile:94) at dly.b(SourceFile:162) at dly$$Lambda$2257/790798176.invoke(Unknown Source) at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36) at org.lwjgl.system.JNI.invokeV(Native Method) at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3174) at com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(SourceFile:127) at dlx.e(SourceFile:1044) at dlx.e(SourceFile:654) at net.minecraft.client.main.Main.main(SourceFile:215)Caused by: io.netty.channel.ChannelException: failed to open a new selector at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:177) at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:151) at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:127) at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:36) at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:84) ... 35 moreCaused by: java.io.IOException: Unable to establish loopback connection at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101) at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68) at java.security.AccessController.doPrivileged(Native Method) at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170) at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50) at java.nio.channels.Pipe.open(Pipe.java:155) at sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:127) at sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44) at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:175) ... 39 moreCaused by: java.net.BindException: Cannot assign requested address: connect at sun.nio.ch.Net.connect0(Native Method) at sun.nio.ch.Net.connect(Net.java:458) at sun.nio.ch.Net.connect(Net.java:450) at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648) at java.nio.channels.SocketChannel.open(SocketChannel.java:189) at sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(PipeImpl.java:130) at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:83) ... 47 more

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
– Head --Thread: Render threadStacktrace: at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:88) at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:58) at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:47) at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:59) at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:77) at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:72) at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:59) at zu.f(SourceFile:54) at zu$$Lambda$3870/1734164240.get(Unknown Source) at ady.a(SourceFile:16) at zu.a(SourceFile:135) at dlx.a(SourceFile:1837) at dlx.a(SourceFile:1702) at dty.n(SourceFile:287) at dty.b(SourceFile:226) at dty$$Lambda$3119/1501535645.onPress(Unknown Source) at dni.b(SourceFile:33) at dnc.a(SourceFile:16) at dng.a(SourceFile:149) at doe.a(SourceFile:27) at dly.b(SourceFile:92) at dly$$Lambda$2908/1610659945.run(Unknown Source)
– Affected screen --Details: Screen name: dtyStacktrace: at dqs.a(SourceFile:431) at dly.a(SourceFile:92) at dly.c(SourceFile:162) at dly$$Lambda$2907/743109550.run(Unknown Source) at amn.execute(SourceFile:94) at dly.b(SourceFile:162) at dly$$Lambda$2257/790798176.invoke(Unknown Source) at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36) at org.lwjgl.system.JNI.invokeV(Native Method) at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3174) at com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(SourceFile:127) at dlx.e(SourceFile:1044) at dlx.e(SourceFile:654) at net.minecraft.client.main.Main.main(SourceFile:215)
– System Details --Details: Minecraft Version: 1.16.1 Minecraft Version ID: 1.16.1 Operating System: Windows 10 (amd64) version 10.0 Java Version: 1.8.0_51, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 1109914808 bytes (1058 MB) / 2113929216 bytes (2016 MB) up to 2147483648 bytes (2048 MB) CPUs: 8 JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M Launched Version: 1.16.1 Backend library: LWJGL version 3.2.2 build 10 Backend API: GeForce GTX 1080/PCIe/SSE2 GL version 4.6.0 NVIDIA 451.48, NVIDIA Corporation GL Caps: Using framebuffer using OpenGL 3.0 Using VBOs: Yes Is Modded: Probably not. Jar signature remains and client brand is untouched. Type: Client (map_client.txt) Resource Packs:  Current Language: English (US) CPU: 8x Intel(R) Core(TM) i7-7820HK CPU @ 2.90GHz