Xcode iOS project only shows "My Mac 64-bit" but not simulator or device

I figured it out. I had to edit the scheme (Product->Scheme->Edit Scheme...), and for some reason no executable was selected. I chose my app, saved and now I have my simulator and device options back.

Here is how I solved this problem. Right-click on the xcodeproj file and select "show package contents." Now delete everything inside the xcuserdata folder. Voila. I hope it helps anyone else out there that is facing this problem.