I've been having issues when using this mod. I try to load into a world, and the game crashes. I know it's this mod, I've tested. I get the error "java.lang.NullPointerException: Cannot invoke "net.minecraft.class_897.method_3933(net.minecraft.class_1297, net.minecraft.class_4604, double, double, double)" because "$$5" is null"

crash report: https://pastebin.com/virdyzXa

There is no 1.19.4 version currently. You are trying to use the 1.19.3 version.

I thought that versions would work as long as they started with the same 1.19 or whatever the first numbers are.

That was the case pre 1.19. But since 1.19.x contains 1.20 updates, and in general, Mojang changing however much they want, each 1.19 update needs its own release.

Ah. Thank you.