Reference to 'X' is ambiguous

Question

After several changes to my project I suddenly get this build error:

Reference to \'kCGImageAlphaPremultipliedLast\' is ambiguous

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Answer 1

I just had the same warnings littering up my build report (but only under the triangle). In the end what worked for me was to insure that EVERY usage of:

#import  

in the app was replaced by:

@import Module;

Now all those annoying warnings are gone!