--- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 4/1/21 8:07 PM
Description: Updating screen events

io.netty.channel.ChannelException: connection refused
at io.netty.channel.local.LocalChannel$LocalUnsafe.connect(LocalChannel.java:361)
at io.netty.channel.DefaultChannelPipeline$HeadHandler.connect(DefaultChannelPipeline.java:1008)
at io.netty.channel.DefaultChannelHandlerContext.invokeConnect(DefaultChannelHandlerContext.java:494)
at io.netty.channel.DefaultChannelHandlerContext.connect(DefaultChannelHandlerContext.java:479)
at io.netty.channel.DefaultChannelHandlerContext.connect(DefaultChannelHandlerContext.java:464)
at io.netty.channel.DefaultChannelPipeline.connect(DefaultChannelPipeline.java:847)
at io.netty.channel.AbstractChannel.connect(AbstractChannel.java:198)
at io.netty.bootstrap.Bootstrap$2.run(Bootstrap.java:187)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:354)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:348)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101)
at java.lang.Thread.run(Unknown Source)

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Stacktrace:
at io.netty.channel.local.LocalChannel$LocalUnsafe.connect(LocalChannel.java:361)
at io.netty.channel.DefaultChannelPipeline$HeadHandler.connect(DefaultChannelPipeline.java:1008)

-- Affected screen --
Details:
Screen name: net.minecraft.client.gui.GuiMainMenu
Stacktrace:
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1645)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:973)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:898)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_281, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 132782184 bytes (126 MB) / 335544320 bytes (320 MB) up to 5905580032 bytes (5632 MB)
JVM Flags: 8 total; -Xmn128M -Xmx5612M -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1614 6 mods loaded, 6 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAAAA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAAAA FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1614-1.7.10.jar)
UCHIJAAAA Forge{10.13.4.1614} [Minecraft Forge] (forge-1.7.10-10.13.4.1614-1.7.10.jar)
UCHIJAAAA tlauncher_custom_cape_skin{1.0} [TLSkinCape] (tlskincape_1.7.10-1.4.jar)
UCHIJAAAA trainsinmotion{2.4 alpha2021-02-07-16:27} [Trains in Motion] (Traincraft(1).jar)
UCHIJAAAA traincraft{5.0.25.0.1} [Traincraft] (Traincraft(1).jar)
GL info: ' Vendor: 'ATI Technologies Inc.' Version: '4.6.13596 Compatibility Profile Context 20.10.32 27.20.1032.2' Renderer: 'AMD Radeon(TM) RX Vega 10 Graphics'
Launched Version: Forge 1.7.10
LWJGL: 2.9.1
OpenGL: AMD Radeon(TM) RX Vega 10 Graphics GL version 4.6.13596 Compatibility Profile Context 20.10.32 27.20.1032.2, ATI Technologies Inc.
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)

Looks like a GUI Issue. Should be fixable

Maybe not quite so easy, looks like a networking related crash somehow. And doesn't actually reference ANY of our code. It's possible it could also be an issue related to TLauncher being trash, but I'll have to look into this further to know one way or another. Thanks for the report!