Error message when exporting

I’m trying to export to HQ STL and every time it says “invalid bodies in the model which cannot be exported”. How do I fix this?

Hi, please check to see if you can export the design in shapr format.

If you can, please send us the file via support@shapr3d.com. We will look into the issue and then get back to you as soon as possible.
Thanks for your patience.