Minecraft Save Loading Issue

Hey!
(I Already completely cleared my .minecraft 2 times and I already tried repairing my game)
I keep having this crash when loading up A world:
The game crashed whilst mouseclicked event handler Error: java.lang.IllegalStateException: failed to create a child event loop Exit Code: -1

And it shows this:
– 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$$Lambda$4148/933174648.get(Unknown Source) at afi.a(SourceFile:16) at aax.a(SourceFile:138) at djz.a(SourceFile:1891) at djz.a(SourceFile:1748) at dsm$a.e(SourceFile:407) at dsm$a.a(SourceFile:317) at dsm$a.a(SourceFile:254) at dlf.a(SourceFile:345) at dmh.a(SourceFile:27) at dka.b(SourceFile:92) at dka$$Lambda$3060/1773103480.run(Unknown Source) – Affected screen – Details: Screen name: dsj Stacktrace: at dot.a(SourceFile:435) at dka.a(SourceFile:92) at dka.c(SourceFile:162) at dka$$Lambda$2955/278738215.run(Unknown Source) at aob.execute(SourceFile:94) at dka.b(SourceFile:162) at dka$$Lambda$2412/967231398.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 djz.e(SourceFile:1071) at djz.e(SourceFile:681) at net.minecraft.client.main.Main.main(SourceFile:215)