~/src/dart-sip-ua/example [master*]$ flutter run Running "flutter pub get" in example... 0.5s Using hardware rendering with device Android SDK built for x86. If you get graphics artifacts, consider enabling software rendering with "--enable-software-rendering". Launching lib/main.dart on Android SDK built for x86 in debug mode... [!] Your app isn't using AndroidX. To avoid potential build failures, you can quickly migrate your app by following the steps on https://goo.gl/CP92wY. FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':app:transformResourcesWithMergeJavaResForDebug'. > More than one file was found with OS independent path 'META-INF/proguard/androidx-annotations.pro' * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights. * Get more help at https://help.gradle.org BUILD FAILED in 21s Running Gradle task 'assembleDebug'... Running Gradle task 'assembleDebug'... Done 21.7s AndroidX incompatibilities may have caused this build to fail. Please migrate your app to AndroidX. See https://goo.gl/CP92wY. Gradle task assembleDebug failed with exit code 1 ~/src/dart-sip-ua/example [master*]$ flutter doctor Doctor summary (to see all details, run flutter doctor -v): [✓] Flutter (Channel stable, v1.12.13+hotfix.5, on Linux, locale en_GB.UTF-8) [✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3) [✓] Android Studio (version 3.5) [✓] VS Code (version 1.40.2) [✓] Connected device (1 available) • No issues found!