"Cannot resolve symbol 'design' " error on Android Studio -


using these 3 lines:

import android.support.design.widget.floatingactionbutton; import android.support.design.widget.snackbar; import android.support.design.widget.toolbar;

i following error:

cannot resolve symbol 'design'.

how solve problem? there files i'm missing?

you need include library in gradle app's file:

compile 'com.android.support:design:26.0.1'

there link include librarys in project


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