Level Editor map testing issue

[Spyplane Moon God]

I was very happy to see Night Dive included their level editor with the Turok 3 release, and I wanted to start learning how to use the editor to make some custom maps. The first issue I ran into is i'm having trouble actually just testing the map to check out how stuff runs. Specifically when I click test the map, I get
"StartGameState->GS_ChangeLevel: failed to load level 128"

(I'm assuming level 128 is shorthand for just the first custom map bc its there automatically).
I'm not sure if I have to like, specifically insert a level load object or trigger physically in the map before the 'test' function actually tests but, I'm not experienced at all with 3D dev, so I figured this is a good learning opportunity.

Has anyone tried the level editor yet? I feel like what I'm missing is like really obvious but I just don't have experience with the tool, but after getting over this hurdle I could probably learn it better on my own.

Any help would be greatly appreciated!