Invalid Lightmap Settings? (Also issues with colliders)

Hi, I’m having two issues you can clearly see in this image. First is the invalid lightmap thing. I couldn’t find a way to fix that issue. And secondly my character prism really shouldn’t be floating. There must be some sort of issue with the circular platforms’s colliders. If I go far away I do fall to the abyss so gravity is affecting me and at some point the colliders do end.

Thanks in advance, hope we can find a way.