If it helps to know my work flow so far this is it: After I export the obj from RC, I import the obj into MeshMixer. I found this to be a great tool to repair holes. It does an amazing job adding geometry that matches the surrounding areas. I export the obj from MeshMixer and then import this into blender, where I did some further smoothing. I exported the obj from Blender and then tried to import it into RC and got the errors above.