I try to migrate my old project to Android X. I searched about it and migrated successfully. I have one problem.In my project,I'm using Card.io. I downloaded and imported into the project from here
https://github.com/card-io/card.io-Android-source
When I try to run my app ,I have this error message
I searched much ,but still can't solve this problem. Unfortunately,I can't open new issue in Github repository, because repository has only read status.
Can anyone explain ,how I can solve this problem? Thanks

We converted to AndroidX a large project and use Card.io. We have implementation 'io.card:android-sdk:5.5.1' in the build.gradle and have no issues. Are you trying to use the source? If you are and don't customize the source, the library implementation should be the best usage.