Thank you all. I'm not even sure why I missed that the first item was not checked off. I had assumed that the claw would count as a docking port. Since I can only accept one answer, I selected @mystifeid since his was first. Again, thank you for pointing out my blind spot. I think (hope) I can resolve this by docking another ship with a docking port (which may make it part of the space station). I'll test it above Kerbin first, and if that doesn't work, I'll go with @jimmymcgoochie's suggestion.