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Android Studio – Class 'Anonymous class derived from Callback' must either be declared abstract or implement abstract method 'onError(Exception)' in 'Callback'

Class 'Anonymous class derived from Callback' must either be declared abstract or implement abstract method 'onError(Exception)' in 'Callback' I am opening an old project. Now how to solve this problem? my code is: Picasso.get().load(p.getImageUrl()).into(iv, new Callback() { @Override public void…

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