I am currently redoing one of my 2017 worlds in Unity 2018.4.13f1 and when I load up my world, the game crashes right after "Initializing World" with only a window popping up which has a red ! on it. I am Using the newest VRCSDK which is available on the VRChat Discord. This happens when I upload it as a private world and when I test it local.
The World ID is: wrld_0c13be85-b803-4d4e-9295-523d995175d4
(If you are able to join, don't judge me, its in an early W.I.P state)