can't resolve AppCompatActivity

Question

After renaming application package name, Android Studio displayed this error can\'t resolve symbol AppCompatActivity

Things I tried: <

Answer 1

head over to build.gradle(module app)

if you hover your mouse over to com.android.support:appcompat a popup will say new version is available just replace in the existing version number with the new version number press sync now and you are good to go p.s nothing else worked for me on 2 pc's