The error is not caused by ArcGIS Runtime SDK for iOS SDK but by Xcode. There are number of reasons why this error comes up. You can google the error for further troubleshooting. Here are few reasons...
1. Check all you product references are consistent in the settings and plists. Also check the product name does not contain a space or other "illegal" characters.
2. Delete the previously installed app (if old version is installed) from device.
3. Make sure that you've valid architectures set at project and target settings.
Hope this helps!
Regards,
Nimesh