---- Minecraft Crash Report -------- Minecraft Crash Report ----// Why did you do that?
Time: 29/04/20 5:25 PMDescription: 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 xu.f(SourceFile:55) at xu$$Lambda$2709/1673729636.get(Unknown Source) at abn.a(SourceFile:16) at xu.a(SourceFile:136) at dbn.a(SourceFile:1676) at djl$a.e(SourceFile:379) at djl$a.a(SourceFile:311) at djk$$Lambda$2160/2125689029.accept(Unknown Source) at java.util.Optional.ifPresent(Optional.java:159) at djk.f(SourceFile:51) at djk$$Lambda$2149/885494376.onPress(Unknown Source) at dcv.onPress(SourceFile:18) at dcq.onClick(SourceFile:15) at dct.mouseClicked(SourceFile:150) at ddr.mouseClicked(SourceFile:27) at dbo.b(SourceFile:86) at dbo$$Lambda$2119/1778792753.run(Unknown Source) at dgb.wrapScreenError(SourceFile:447) at dbo.a(SourceFile:86) at dbo.c(SourceFile:150) at dbo$$Lambda$2118/434497606.run(Unknown Source) at ais.execute(SourceFile:94) at dbo.b(SourceFile:150) at dbo$$Lambda$1505/1250213559.invoke(Unknown Source) at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36) at org.lwjgl.system.JNI.invokeV(Native Method) at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3174) at com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(SourceFile:123) at dbn.d(SourceFile:1015) at dbn.d(SourceFile:619) at net.minecraft.client.main.Main.main(SourceFile:204)Caused by: io.netty.channel.ChannelException: failed to open a new selector at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:177) at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:151) at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:127) at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:36) at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:84) ... 37 moreCaused by: java.io.IOException: Unable to establish loopback connection at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101) at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68) at java.security.AccessController.doPrivileged(Native Method) at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170) at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50) at java.nio.channels.Pipe.open(Pipe.java:155) at sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:127) at sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44) at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:175) ... 41 moreCaused by: java.net.ConnectException: Connection refused: connect at sun.nio.ch.Net.connect0(Native Method) at sun.nio.ch.Net.connect(Net.java:458) at sun.nio.ch.Net.connect(Net.java:450) at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648) at java.nio.channels.SocketChannel.open(SocketChannel.java:189) at sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(PipeImpl.java:130) at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:83) ... 49 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 xu.f(SourceFile:55) at xu$$Lambda$2709/1673729636.get(Unknown Source) at abn.a(SourceFile:16) at xu.a(SourceFile:136) at dbn.a(SourceFile:1676) at djl$a.e(SourceFile:379) at djl$a.a(SourceFile:311) at djk$$Lambda$2160/2125689029.accept(Unknown Source) at java.util.Optional.ifPresent(Optional.java:159) at djk.f(SourceFile:51) at djk$$Lambda$2149/885494376.onPress(Unknown Source) at dcv.onPress(SourceFile:18) at dcq.onClick(SourceFile:15) at dct.mouseClicked(SourceFile:150) at ddr.mouseClicked(SourceFile:27) at dbo.b(SourceFile:86) at dbo$$Lambda$2119/1778792753.run(Unknown Source)
– Affected screen --Details: Screen name: djkStacktrace: at dgb.wrapScreenError(SourceFile:447) at dbo.a(SourceFile:86) at dbo.c(SourceFile:150) at dbo$$Lambda$2118/434497606.run(Unknown Source) at ais.execute(SourceFile:94) at dbo.b(SourceFile:150) at dbo$$Lambda$1505/1250213559.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:123) at dbn.d(SourceFile:1015) at dbn.d(SourceFile:619) at net.minecraft.client.main.Main.main(SourceFile:204)
– System Details --Details: Minecraft Version: 1.15.2 Minecraft Version ID: 1.15.2 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: 1684260208 bytes (1606 MB) / 2080374784 bytes (1984 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: 1.15.2 Backend library: LWJGL version 3.2.2 build 10 Backend API: GeForce RTX 2080 SUPER/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) Resource Packs:  Current Language: English (US) CPU: 8x Intel(R) Core(TM) i7-9700K CPU @ 3.60GHz

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Note I have turned off all anti-virus