The scheme ‘PrintingWebView’ contains no buildables that can be built for the SDKs supported by the run destination My Mac 64-bit. Make sure your targets all specify SDKs that are supported by this version of Xcode.

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I’ve met with this problem.
In my case, the following steps can solve it:
your project -> target -> Build Setting
Modify following items: 1.Base SDK ; 2.Architectures ; 3.iOS Deployment Target.
And then clean and build the application.