Painting Terrain Causes Unreal to Crash

Every time I go into the “Landscape” tab, and then try to go into the “Paint” tab, Unreal immediately crashes.

I am following [This Guide][1] to make a terrain material. I have used this guide in the past (successfully) to make a terrain blend material. Here is what my Terrain Material looks like after following their guide:

This is my material setup, and right away, the terrain preview is black. Is this normal? In the tutorial, theirs is not black, but shows a blend of the textures. It also leads to the terrain becoming black as well, as seen below:

Now, you’re going to have to take my word for this next part, but the moment I try to go into the Paint Tab, Unreal immediately crashes and asks me to send an error report.

Am I doing something wrong here? I have gone through the tutorial a few times to see if I missed something.

P.S. This happens on both 4.17.2 and 4.18.1.