[ionic4] - no such file - ios/platform_www/cordova.js

When I run ionic cordova prepare ios on my Macbook Air, I get the following error:

ENOENT: no such file or directory, open '/Users/…/Ionic/EMSProv4/platforms/ios/platform_www/cordova.js

I was previously able to run this command but after moving my latest code over (from Windows machine), now suddenly there is an issue.

Any ideas on where to troublshoot this?

delete ios and recreate…