getter isnot defined

[millievn]

I cloned this repository and run pub get. But some problem still show in the terminal. Maybe something with the code.

The getter 'Columns' isn't defined for the class 'Song'.
Try importing the library that defines 'Columns', correcting the name to the name of an existing getter, or defining a getter or field named 'Columns'.

class Song {
  int id;
  String artist;
  String title;
  String album;
  int albumId;
  int duration;
  String uri;
  String albumArt;

  Song(this.id, this.artist, this.title, this.album, this.albumId,
      this.duration, this.uri, this.albumArt);
  Song.fromMap(Map m) {
    id = m["id"];
    artist = m["artist"];
    title = m["title"];
    album = m["album"];
    albumId = m["albumId"];
    duration = m["duration"];
    uri = m["uri"];
    albumArt = m["albumArt"];
  }
}

[avirias]

1