Invalid module name: 'Flutter QR Code' - must be a valid Dart package name (lower_case_with_underscores).
It should be all lowercase, with underscores to separate words, just_like_this.
Stick with basic Latin letters and Arabic digits: [a-z0-9_] and ensure that
it’s a valid Dart identifier (i.e. doesn’t start with digits and isn’t a
reserved word).
Try to pick a name that is clear, terse, and not already in use.