Lighting build failed, swarm failed to kick off??

Hi, this is the first time I’ve had this issue. I imported the level from a parent project to a new project to keep the file size down and worked on the lighting a bit. went to build lighting and im getting the error “lighting build failed, swam failed to kick off”. I had to delete my saved and intermediate files because unreal crashed at one point and wouldnt re-open the level, it would just stick at 80%. deleting those two files and re-opening fixed the problem. Not sure if that had anything to do with getting this error or not but thought i’d include. I also dont know if this is because I moved the level from the parent level which had all the material parents in it. a lot of the assets in this level are instances that have no proper material parents attached so I dont know if that caused it either. All the meshes with materials on it are showing up fine without the parent materials however. Any input is greatly appreciated thank you