Clicking the upload button shows the error message Cannot invoke "ctt.c()" because "this.b" is null.

What I expected to happen was...:
I thought it would open up the world selection menu.

What actually happened was...:
It popped up a error message, reading Cannot invoke "ctt.c()" because "this.b" is null.

Steps to Reproduce:
1. Go to your realm and press configure.
2. Click reset world.
3. Click Upload world, there you should see Cannot invoke "ctt.c()" because "this.b" is null.