Xcode cannot run using the selected destination


I’m attempting to run the programming that prints the 4 items in the array to the log. When I try to run it, I get the error
"Xcode cannot run using the selected destination. Choose a destination with a supported architecture in order to run on this system."

At the top left, it says RandomPosessions > My Mac 64-bit. In the project Build Settings, the architecture is set to 64-bit Intel.

If I switch it to 32 bit, it works fine. What do I need to do to get it to work on 64 bit?