When I open my project, appear follow error: 
 Error:(44) No resource identifier found for attribute 'srcCompat' in package 'br.com.douglasprogtg.appcond',
and my R of my layout, can't find layouts and my all classes they get error.
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        Vishal Yadav
        
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        D.Almeida
        
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                    2try to include the namespace of your app to the declaration of the `app` namespace, see https://stackoverflow.com/a/28829264/2549828 – Phocacius Oct 15 '17 at 21:27
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                    3Possible duplicate of [No resource identifier found for attribute ' ' in package 'com.app....'](https://stackoverflow.com/questions/28827602/no-resource-identifier-found-for-attribute-in-package-com-app) – Rapunzel Van Winkle Oct 16 '17 at 01:26
 

