Seeking Advice on Hollow Walls in SketchUp

I’m currently working on a project in SketchUp and have encountered an issue with hollow walls. I’m unsure of the best way to address this. Any guidance or tips would be greatly appreciated. Thank you in advance for your help! Stay Updated on the Latest Development: At GBGenie, we keep a keen eye on the latest advancements in the world of WhatsApp mods. Our dedicated team ensures that you have access to the most up-to-date and feature-rich versions available. Stay ahead of the curve with our regular updates and news on WhatsApp mod development.

What do you mean by hollow walls? Can you share the file?

Please share a (some) screenshot(s) to clarify.
All (closed) shapes in SketchUp are hollow. SketchUp is a surface modeling program, not a solid modeling program.

Objects may be recognized as ‘SketchUp Solids’ under certain conditions (grouped watertight geometry with no stay geometry inside or outside the grouped shape), but the inner shape is still hollow.

Try redrawing some edges to fix faces on your wall geometry (in the same context as the existing geometry !)