Hello,

I have a problem launching a new Minecraft world (in version 1.16.4) when I run minecraft is that I am in the Minecraft menu (singleplayer; Mutiplayer; ... ect) I click singplayer then creation of a new one world then to 100% it crashes and it me but the report of the crash, I will give you a screenshot and the text file.

Here it is :

---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 17/11/20 00:58
Description: 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 aax.f(SourceFile:56)
at aax$$Lambda$4048/965928993.get(Unknown Source)
at afi.a(SourceFile:16)
at aax.a(SourceFile:138)
at djz.a(SourceFile:1891)
at djz.a(SourceFile:1752)
at dsf.o(SourceFile:298)
at dsf.b(SourceFile:238)
at dsf$$Lambda$3286/1951830231.onPress(Unknown Source)
at dlj.b(SourceFile:33)
at dld.a(SourceFile:16)
at dlh.a(SourceFile:149)
at dmh.a(SourceFile:27)
at dka.b(SourceFile:92)
at dka$$Lambda$3002/210970463.run(Unknown Source)
at dot.a(SourceFile:435)
at dka.a(SourceFile:92)
at dka.c(SourceFile:162)
at dka$$Lambda$3001/1748111913.run(Unknown Source)
at aob.execute(SourceFile:94)
at dka.b(SourceFile:162)
at dka$$Lambda$2355/387608529.invoke(Unknown Source)
at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36)
at org.lwjgl.system.JNI.invokeV(Native Method)
at org.lwjgl.glfw.GLFW.glfwPollEvents(GLFW.java:3101)
at com.mojang.blaze3d.systems.RenderSystem.flipFrame(SourceFile:109)
at dez.e(SourceFile:308)
at djz.e(SourceFile:1068)
at djz.e(SourceFile:681)
at net.minecraft.client.main.Main.main(SourceFile:215)
Caused by: io.netty.channel.ChannelException: failed to open a new selector
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:177)
at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:151)
at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:127)
at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:36)
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:84)
... 36 more
Caused by: java.io.IOException: Unable to establish loopback connection
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)
at java.security.AccessController.doPrivileged(Native Method)
at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)
at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)
at java.nio.channels.Pipe.open(Pipe.java:155)
at sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:127)
at sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44)
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:175)
... 40 more
Caused by: java.net.BindException: Cannot assign requested address: connect
at sun.nio.ch.Net.connect0(Native Method)
at sun.nio.ch.Net.connect(Net.java:458)
at sun.nio.ch.Net.connect(Net.java:450)
at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
at java.nio.channels.SocketChannel.open(SocketChannel.java:189)
at sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(PipeImpl.java:130)
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:83)
... 48 more

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Thread: Render thread
Stacktrace:
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 aax.f(SourceFile:56)
at aax$$Lambda$4048/965928993.get(Unknown Source)
at afi.a(SourceFile:16)
at aax.a(SourceFile:138)
at djz.a(SourceFile:1891)
at djz.a(SourceFile:1752)
at dsf.o(SourceFile:298)
at dsf.b(SourceFile:238)
at dsf$$Lambda$3286/1951830231.onPress(Unknown Source)
at dlj.b(SourceFile:33)
at dld.a(SourceFile:16)
at dlh.a(SourceFile:149)
at dmh.a(SourceFile:27)
at dka.b(SourceFile:92)
at dka$$Lambda$3002/210970463.run(Unknown Source)

– Affected screen –
Details:
Screen name: dsf
Stacktrace:
at dot.a(SourceFile:435)
at dka.a(SourceFile:92)
at dka.c(SourceFile:162)
at dka$$Lambda$3001/1748111913.run(Unknown Source)
at aob.execute(SourceFile:94)
at dka.b(SourceFile:162)
at dka$$Lambda$2355/387608529.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.glfwPollEvents(GLFW.java:3101)
at com.mojang.blaze3d.systems.RenderSystem.flipFrame(SourceFile:109)
at dez.e(SourceFile:308)
at djz.e(SourceFile:1068)
at djz.e(SourceFile:681)
at net.minecraft.client.main.Main.main(SourceFile:215)

– System Details –
Details:
Minecraft Version: 1.16.4
Minecraft Version ID: 1.16.4
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: 660280784 bytes (629 MB) / 2013265920 bytes (1920 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: 1.16.4
Backend library: LWJGL version 3.2.2 build 10
Backend API: GeForce GTX 1080/PCIe/SSE2 GL version 4.6.0 NVIDIA 445.87, 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)
Graphics mode: fancy
Resource Packs:
Current Language: English (US)
CPU: 8x Intel(R) Core(TM) i7-7820HK CPU @ 2.90GHz

Thank you for your reply