iOS builds including cordova-ios v4.5.5 or earlier will fail with this error in Appflow. This issue was corrected in cordova-ios v5.0.0. Updating to a current cordova-ios release will resolve the problem.
To remove and reinstall the iOS platform:
ionic cordova platform rm ios
ionic cordova platform add email@example.com
//the latest release of the current major version is recommended. This
example specifies the latest version at the time of writing
Seems to be a very old project file format
- please open your project file in a more recent version of Xcode