Execution failed for task ':app:checkDebugAarMetadata'.
> Could not resolve all files for configuration ':app:debugRuntimeClasspath'.
   > Could not find any version that matches com.android.support:support-v4:0.+.
     Versions that do not match:
       - 28.0.0
       - 28.0.0-rc02
       - 28.0.0-rc01
       - 28.0.0-beta01
       - 28.0.0-alpha3
       - + 51 more
     Searched in the following locations:
       - https://dl.google.com/dl/android/maven2/com/android/support/support-v4/maven-metadata.xml
       - https://jcenter.bintray.com/com/android/support/support-v4/maven-metadata.xml
       - file:/home/pc/.m2/repository/com/android/support/support-v4/
       - https://repo.maven.apache.org/maven2/com/android/support/support-v4/maven-metadata.xml
       - file:/home/pc/sviluppo/myapp/android/target/myapp-android-1.0-SNAPSHOT-android-source/app/libs/
     Required by:
         project :app
   > Could not find any version that matches com.android.support:appcompat-v7:0.+.
     Versions that do not match:
       - 28.0.0
       - 28.0.0-rc02
       - 28.0.0-rc01
       - 28.0.0-beta01
       - 28.0.0-alpha3
       - + 50 more
     Searched in the following locations:
       - https://dl.google.com/dl/android/maven2/com/android/support/appcompat-v7/maven-metadata.xml
       - https://jcenter.bintray.com/com/android/support/appcompat-v7/maven-metadata.xml
       - file:/home/pc/.m2/repository/com/android/support/appcompat-v7/
       - https://repo.maven.apache.org/maven2/com/android/support/appcompat-v7/maven-metadata.xml
       - file:/home/pc/sviluppo/myapp/android/target/myapp-android-1.0-SNAPSHOT-android-source/app/libs/
     Required by:
         project :app

Possible solution:
 - Declare repository providing the artifact, see the documentation at https://docs.gradle.org/current/userguide/declaring_repositories.html