"Xcode must be fully installed before you can continue"

Recently, I ran into a hiccup on Expo when I was trying to open up an iOS device. And if you found this, maybe you have too.

"Xcode must be fully installed before you can continue".

The problem was I did have it installed.

The simple fix, run the following command:

sudo xcode-select -s /Applications/Xcode.app/Contents/Developer

Thanks to this thread, I was able to get over it.