Not 100% sure since I don’t recognize that language, but the first line looks like it is saying you don’t have a Lightmass Importance Volume in your level.
In order to fix that go to the Modes tab and under the “Volumes” section drag out a Lightmass Importance Volume and then scale it up so it surrounds your level content.
Here’s some more info on what they do:
.unrealengine.com/en-us/Engine/Rendering/LightingAndShadows/Lightmass/Basics
Hope that helps!
