For some reason Xcode was running an old version of my app on the device. To fix it I deleted the app on my device after trying to reboot everyone. Now Xcode won't run on the device giving me:
error: failed to launch
No such file or directory (/Users/me/Library/Developer/Xcode/DerivedData/Foo-ebesorzwidboecgphqwmmzabjvoe/Build/Products/Debug-iphoneos/Foo.app/Foo)
EDIT - I added the directory. It is a directory on my Mac. Why would deleting the app from the iphone cause this?
EDIT2 - and its lying because the app is there. Runs fine on simulator.