Radiation Analysis with Meshes

Hello, I am new to Grasshopper. I am trying to make radiation analysis with ladybug. I have site with buildings which are meshes. I tried inputting the buildings into radiation analysis, but it didnt work. I am using Rhino 7 and downloaded ladybug legacy. Anyone can help with this?
Here are the datas: Google Drive: Sign-in
Thank you!

Regards,
Tasha