Swarm kick off issue with Datasmith assets

So Im running into some swarm kick off issues when building light mass. If I import a datasmith file that has multiple items in it… Like cars, tables and chairs apparently the geometry is bad and i cant buikd lightmass until i delete the assets. Thoughts? I wounder if this is resolved in 4.19?

Figured out the issue with swarm…I needed to go into each asset and set the correct lightmap resolution and uvs.