The launcher was downloading 18w01a folder. Then when it loaded, it showed that Minecraft had started up running, but then for some reason, it crashes immediately.
Game Output:
02:01:05 launcher main info Preparing to launch minecraft client for 18w01a
02:01:05 launcher main info Checking installations.
02:01:05 launcher main info Minecraft client 18w01a is ready to start.
02:01:05 launcher main info Starting!
02:01:05 launcher main info Using default game log configuration client-1.12.xml (outputs XML)
02:01:06 bnv Client thread info Setting user: PugtatoDaFrancis
02:01:08 bnv Client thread info LWJGL Version: 3.1.2 build 29
Crash Report: https://pastebin.com/B5bdfyqS
Linked issues
Comments

I don't really know if this is a Launcher issue or a Minecraft issue, or what I have done wrong... but it looks like the game output is loading 1.12.xml config instead of a 1.13 (If there is one?..)) I don't really knoww