b.dev/packages/flutter_painter/example to create a custom widget, but I'm encountering the following error: "Target of URI doesn't exist: 'package:phosphor_flutter/phosphor_flutter.dart'. Try creating the file referenced by the URI, or try using a URI for a file that does exist." I've encountered a similar issue when trying to use other packages. How can I resolve this?
(My ultimate goal is to be able to retrieve .jpg image files via an API, allow users to interact with them using a touchscreen pen on an iPad for rating, commenting, and editing, and then return the modified images to a database.)