O meu esta apresentando o seguinte erro. no layout item_pacote.xml:
The following classes could not be found:
- android.support.constraint.ConstraintLayout ( Add constraint-layout library dependency to the project, Fix Build Path, Edit XML, Create Class)
- android.support.v7.widget.CardView (Fix Build Path, Edit XML, Create Class) Tip: Try to build the project. Tip: Try to refresh the layout.
Isso acontece quando eu uso o ConstraintLayout.
Estou usando Android Studio 3.6.3