So i was making a project and i wanted to save the data locally. So i added shared preferences package to my flutter project step by step as shown in this link: https://pub.dev/packages/shared_preferences/install and it also reflected in my pubspec.yaml file under the dependencies . But when i run flutter run it gives this error:

Is spren_flutter package free? Or is there any free tier available to calculate HRV using spren_flutter?

The package code from pub.dev is cached locally. Can the code be modified for debugging?