Enclosure error on non-connected parts

I am getting an error when creating an enclosure for this bike frame. I have no issues when it is the frame by itself but when I put in the wheels there is an error. Currently I have this whole assembly saved as a .prt and I am not sure if I need to make it an assembly file or if the tires need to make physical contact with the rest of the model. Thanks

Hi @nvan_gordon welcome to the forum!

Can you please set your project to public and share the link. It is much easier to others to help you when we can get a better look at your model.

Thanks,

Dan