Android Question Material Dialog Error with AndroidX SDK

hi guys i just create an app that using MaterialDialog lib, so i extend the activity like this:


B4X:
#BridgeLogger:true
#Extends:android.support.v7.app.AppCompatActivity
#Extends: de.amberhome.materialdialogs.MaterialDialogsActivity
#AdditionalRes: ..\resource

but i got this error

error1.PNG

sho what i miss? help me please...

cheers!
 
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