Thanks! First of all thanks for taking the time.
Adding that framework solved the problem. The thing is that I have "my own template" on which I build upon. Starting from scratch, from the Tier 2 iOS template project, was going to be a pain in the neck; but fortunately I just added the framework in "Linked Frameworks and Libraries" and that did the job. I assume I won't have trouble for fixing things this way. Or will I?
iMac Book Pro, MacOS 10.12.4, Xcode 9.0 (9A235);
iPhone 6, iOS 9.35; iPhone 5s, iOS 9.35; iPad (3rd gen), iOS 9.35;
Dell Precision T7400, Windows 7 Professional 64bit, Visual Studio Community 2015;