Make solid

Hi.
After I removed the roof from parts of this house, I haven’t been able to make it solid again. Is there anyone who can find the error? I’m only using SketchUp Free and therefore don’t have Solid Inspector.

Ltv44sikkerhetskopi18.6.25.skp (242.9 KB)

The model needs to be a group or component, yours is just raw geometry. The model must be correctly drawn, with no missing edges or faces.

Thank you for taking the time to explain this. Thanks for the explanatory video. Now I see the mistakes in the model. Thank you.