I've started to get crashes today, the reason why is unknown to me. At first I thought it was a mod with libraries I had loaded in, which was Botania, but that wasn't the case, after I removed it. The game runs fine as of MC version 1.16.5, without any mods enabled, and the texture packs I have enabled haven't given me any problems. The basic error code I get when I launch from the default Mojang Minecraft Launcher is this.
The game crashed whilst initializing game
Error: java.lang.RuntimeException:
java.util.concurrent.CompletionException:
java.lang.ArrayIndexOutOfBoundsException: -2130654563
And it exited with an error code of -1.
I tried looking into what the error code was, but I couldn't gleam any information regarding my circumstances.
Here is the latest crash log, https://pastebin.com/1jAbTEmX.