As the summary states, I can't load any world at all. always crashes. I just updated today. Keep getting this crash report. Please help.

---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 12/15/19 2:14 PM
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 xu.f(SourceFile:55)
at xu$$Lambda$2706/2096503027.get(Unknown Source)
at abn.a(SourceFile:16)
at xu.a(SourceFile:136)
at dbl.a(SourceFile:1634)
at dji$a.e(SourceFile:379)
at dji$a.a(SourceFile:311)
at djh$$Lambda$2157/1096333103.accept(Unknown Source)
at java.util.Optional.ifPresent(Optional.java:159)
at djh.f(SourceFile:51)
at djh$$Lambda$2151/462914986.onPress(Unknown Source)
at dct.onPress(SourceFile:18)
at dco.onClick(SourceFile:15)
at dcr.mouseClicked(SourceFile:150)
at ddp.mouseClicked(SourceFile:27)
at dbm.b(SourceFile:86)
at dbm$$Lambda$2085/1415454731.run(Unknown Source)
at dfz.wrapScreenError(SourceFile:447)
at dbm.a(SourceFile:86)
at dbm.c(SourceFile:150)
at dbm$$Lambda$2084/260160812.run(Unknown Source)
at aip.execute(SourceFile:94)
at dbm.b(SourceFile:150)
at dbm$$Lambda$1478/1612952911.invoke(Unknown Source)
at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36)
at org.lwjgl.system.JNI.invokeV(Native Method)
at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3174)
at com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(SourceFile:123)
at dbl.d(SourceFile:973)
at dbl.b(SourceFile:585)
at net.minecraft.client.main.Main.main(SourceFile:202)
Caused by: io.netty.channel.ChannelException: failed to open a new selector
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:177)
at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:151)
at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:127)
at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:36)
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:84)
... 37 more
Caused by: java.io.IOException: Unable to establish loopback connection
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)
at java.security.AccessController.doPrivileged(Native Method)
at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)
at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)
at java.nio.channels.Pipe.open(Pipe.java:155)
at sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:127)
at sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44)
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:175)
... 41 more
Caused by: java.net.ConnectException: Connection timed out: connect
at sun.nio.ch.Net.connect0(Native Method)
at sun.nio.ch.Net.connect(Net.java:458)
at sun.nio.ch.Net.connect(Net.java:450)
at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
at java.nio.channels.SocketChannel.open(SocketChannel.java:189)
at sun.nio.ch.PipeImpl$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 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 xu.f(SourceFile:55)
at xu$$Lambda$2706/2096503027.get(Unknown Source)
at abn.a(SourceFile:16)
at xu.a(SourceFile:136)
at dbl.a(SourceFile:1634)
at dji$a.e(SourceFile:379)
at dji$a.a(SourceFile:311)
at djh$$Lambda$2157/1096333103.accept(Unknown Source)
at java.util.Optional.ifPresent(Optional.java:159)
at djh.f(SourceFile:51)
at djh$$Lambda$2151/462914986.onPress(Unknown Source)
at dct.onPress(SourceFile:18)
at dco.onClick(SourceFile:15)
at dcr.mouseClicked(SourceFile:150)
at ddp.mouseClicked(SourceFile:27)
at dbm.b(SourceFile:86)
at dbm$$Lambda$2085/1415454731.run(Unknown Source)

– Affected screen –
Details:
Screen name: djh
Stacktrace:
at dfz.wrapScreenError(SourceFile:447)
at dbm.a(SourceFile:86)
at dbm.c(SourceFile:150)
at dbm$$Lambda$2084/260160812.run(Unknown Source)
at aip.execute(SourceFile:94)
at dbm.b(SourceFile:150)
at dbm$$Lambda$1478/1612952911.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 dbl.d(SourceFile:973)
at dbl.b(SourceFile:585)
at net.minecraft.client.main.Main.main(SourceFile:202)

– System Details –
Details:
Minecraft Version: 1.15
Minecraft Version ID: 1.15
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: 961526728 bytes (916 MB) / 1509949440 bytes (1440 MB) up to 2147483648 bytes (2048 MB)
CPUs: 4
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
Backend library: LWJGL version 3.2.2 build 10
Backend API: GeForce GTX 1070/PCIe/SSE2 GL version 4.6.0 NVIDIA 419.67, 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: 4x Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz