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  1. Minecraft Launcher
  2. MCL-20082

Whenever I load a world or open a server my minecraft has an error.

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    • Icon: Bug Bug
    • Resolution: Duplicate
    • None
    • 2.2.7264 (NEW Windows App)
    • Minecraft Launcher
    • None
    • Windows 11 Home Insider Preview build 22489 Dev, Minecraft Java Edition Version 1.17.1
    • Unconfirmed

      I recently upgraded to the new Minecraft Java Windows launcher that was released on october 2. Whenever i open a world or a server, minecraft has this error java.lang.IllegalStateException: failed to create a child event loop. I allowed the app to Windows Defender firewall but it still gave me the error. Im on java edition

      I tried uninstalling it but it didnt work pls help me please

      Heres the crash report

      ---- Minecraft Crash Report -------- Minecraft Crash Report ----// Uh... Did I do that?
      Time: 03/11/2021, 5:40 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 aci.f(SourceFile:56) at com.google.common.base.Suppliers$NonSerializableMemoizingSupplier.get(Suppliers.java:160) at agx.a(SourceFile:19) at aci.a(SourceFile:148) at dvp.a(SourceFile:2083) at dvp.a(SourceFile:1939) at eel$a.h(SourceFile:437) at eel$a.b(SourceFile:343) at eel$a.a(SourceFile:279) at dww.a(SourceFile:359) at dxx.a(SourceFile:27) at dvq.b(SourceFile:94) at eaq.a(SourceFile:490) at dvq.a(SourceFile:94) at dvq.c(SourceFile:165) at aqv.execute(SourceFile:101) at dvq.b(SourceFile:165) 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:190) at dvp.f(SourceFile:1140) at dvp.e(SourceFile:728) at net.minecraft.client.main.Main.main(SourceFile:217)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) ... 30 moreCaused by: java.io.IOException: Unable to establish loopback connection at java.base/sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101) at java.base/sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:67) at java.base/java.security.AccessController.doPrivileged(AccessController.java:554) at java.base/sun.nio.ch.PipeImpl.<init>(PipeImpl.java:194) at java.base/sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:143) at java.base/sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44) at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:175) ... 34 moreCaused by: java.net.SocketException: Invalid argument: connect at java.base/sun.nio.ch.UnixDomainSockets.connect0(Native Method) at java.base/sun.nio.ch.UnixDomainSockets.connect(UnixDomainSockets.java:146) at java.base/sun.nio.ch.UnixDomainSockets.connect(UnixDomainSockets.java:142) at java.base/sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:849) at java.base/java.nio.channels.SocketChannel.open(SocketChannel.java:285) at java.base/sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(PipeImpl.java:131) at java.base/sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:83) ... 40 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 aci.f(SourceFile:56) at com.google.common.base.Suppliers$NonSerializableMemoizingSupplier.get(Suppliers.java:160) at agx.a(SourceFile:19) at aci.a(SourceFile:148) at dvp.a(SourceFile:2083) at dvp.a(SourceFile:1939) at eel$a.h(SourceFile:437) at eel$a.b(SourceFile:343) at eel$a.a(SourceFile:279) at dww.a(SourceFile:359) at dxx.a(SourceFile:27) at dvq.b(SourceFile:94)
      • Affected screen --Details: Screen name: eeiStacktrace: at eaq.a(SourceFile:490) at dvq.a(SourceFile:94) at dvq.c(SourceFile:165) at aqv.execute(SourceFile:101) at dvq.b(SourceFile:165) 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)
      • Last reload --Details: Reload number: 1 Reload reason: initial Finished: Yes Packs: DefaultStacktrace: at dvx.a(SourceFile:49) at dvp.c(SourceFile:2406) at dvp.e(SourceFile:747) at net.minecraft.client.main.Main.main(SourceFile:217)
      • System Details --Details: Minecraft Version: 1.17.1 Minecraft Version ID: 1.17.1 Operating System: Windows 10 (amd64) version 10.0 Java Version: 16.0.1, Microsoft Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft Memory: 762988432 bytes (727 MiB) / 1811939328 bytes (1728 MiB) up to 2147483648 bytes (2048 MiB) CPUs: 16 Processor Vendor: AuthenticAMD Processor Name: AMD Ryzen 7 4800H with Radeon Graphics          Identifier: AuthenticAMD Family 23 Model 96 Stepping 1 Microarchitecture: unknown Frequency (GHz): 2.89 Number of physical packages: 1 Number of physical CPUs: 8 Number of logical CPUs: 16 Graphics card #0 name: NVIDIA GeForce GTX 1650 Graphics card #0 vendor: NVIDIA (0x10de) Graphics card #0 VRAM (MB): 4095.00 Graphics card #0 deviceId: 0x1f99 Graphics card #0 versionInfo: DriverVersion=30.0.14.9649 Memory slot #0 capacity (MB): 8192.00 Memory slot #0 clockSpeed (GHz): 3.20 Memory slot #0 type: DDR4 Virtual memory max (MB): 20349.32 Virtual memory used (MB): 13409.30 Swap memory total (MB): 12288.00 Swap memory used (MB): 428.75 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: 1.17.1 Backend library: LWJGL version 3.2.2 build 10 Backend API: NVIDIA GeForce GTX 1650/PCIe/SSE2 GL version 3.2.0 NVIDIA 496.49, NVIDIA Corporation Window size: 1920x991 GL Caps: Using framebuffer using OpenGL 3.2 GL debug messages:  Using VBOs: Yes Is Modded: Probably not. Jar signature remains and both client + server brands are untouched. Type: Integrated Server (map_client.txt) Graphics mode: fancy Resource Packs:  Current Language: English (US) CPU: 16x AMD Ryzen 7 4800H with Radeon Graphics  Player Count: 0 / 8; [] Data Packs: vanilla

            Unassigned Unassigned
            Idjdjdj1397 Gabriel Luis B. Magpayo
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              Created:
              Updated:
              Resolved: