It says "shutting down internal servers" and then crashes. This is the crash report:
---- Minecraft Crash Report ----
// This is a token for 1 free hug. Redeem at your nearest Mojangsta: [~~HUG~~]
Time: 5/28/19 3:16 PM
Description: Updating screen events
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:58)
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 net.minecraft.network.NetworkSystem$1.func_179280_b(NetworkSystem.java:52)
at net.minecraft.network.NetworkSystem$1.func_179280_b(NetworkSystem.java:49)
at net.minecraft.util.LazyLoadBase.func_179281_c(SourceFile:10)
at net.minecraft.network.NetworkSystem.func_151270_a(NetworkSystem.java:140)
at net.minecraft.client.Minecraft.func_71371_a(Minecraft.java:2414)
at net.minecraftforge.fml.client.FMLClientHandler.tryLoadExistingWorld(FMLClientHandler.java:734)
at net.minecraft.client.gui.GuiListWorldSelectionEntry.func_186777_e(GuiListWorldSelectionEntry.java:249)
at net.minecraft.client.gui.GuiListWorldSelectionEntry.func_186774_a(GuiListWorldSelectionEntry.java:199)
at net.minecraft.client.gui.GuiListWorldSelectionEntry.func_148278_a(GuiListWorldSelectionEntry.java:163)
at net.minecraft.client.gui.GuiListExtended.func_148179_a(SourceFile:41)
at net.minecraft.client.gui.GuiWorldSelection.func_73864_a(SourceFile:117)
at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:533)
at net.minecraft.client.gui.GuiWorldSelection.func_146274_d(SourceFile:49)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:501)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1759)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1098)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:398)
at net.minecraft.client.main.Main.main(SourceFile:123)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: io.netty.channel.ChannelException: failed to open a new selector
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:157)
at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:149)
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 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$Initializer.run(PipeImpl.java:68)
at java.security.AccessController.doPrivileged(Native Method)
at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)
at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)
at java.nio.channels.Pipe.open(Pipe.java:155)
at sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:127)
at sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44)
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:155)
... 34 more
Caused by: java.net.SocketException: Permission denied: connect
at sun.nio.ch.Net.connect0(Native Method)
at sun.nio.ch.Net.connect(Net.java:458)
at sun.nio.ch.Net.connect(Net.java:450)
at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
at java.nio.channels.SocketChannel.open(SocketChannel.java:189)
at sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(PipeImpl.java:130)
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:83)
... 42 more
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Thread: Client 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:58)
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 net.minecraft.network.NetworkSystem$1.func_179280_b(NetworkSystem.java:52)
at net.minecraft.network.NetworkSystem$1.func_179280_b(NetworkSystem.java:49)
at net.minecraft.util.LazyLoadBase.func_179281_c(SourceFile:10)
at net.minecraft.network.NetworkSystem.func_151270_a(NetworkSystem.java:140)
at net.minecraft.client.Minecraft.func_71371_a(Minecraft.java:2414)
at net.minecraftforge.fml.client.FMLClientHandler.tryLoadExistingWorld(FMLClientHandler.java:734)
at net.minecraft.client.gui.GuiListWorldSelectionEntry.func_186777_e(GuiListWorldSelectionEntry.java:249)
at net.minecraft.client.gui.GuiListWorldSelectionEntry.func_186774_a(GuiListWorldSelectionEntry.java:199)
at net.minecraft.client.gui.GuiListWorldSelectionEntry.func_148278_a(GuiListWorldSelectionEntry.java:163)
at net.minecraft.client.gui.GuiListExtended.func_148179_a(SourceFile:41)
at net.minecraft.client.gui.GuiWorldSelection.func_73864_a(SourceFile:117)
at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:533)
at net.minecraft.client.gui.GuiWorldSelection.func_146274_d(SourceFile:49)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:501)
-- Affected screen --
Details:
Screen name: net.minecraft.client.gui.GuiScreenWorking
Stacktrace:
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1759)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1098)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:398)
at net.minecraft.client.main.Main.main(SourceFile:123)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
-- System Details --
Details:
Minecraft Version: 1.12.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 567384080 bytes (541 MB) / 1040187392 bytes (992 MB) up to 2147483648 bytes (2048 MB)
