报错信息

Error on line 30, column 5 of pubspec.yaml: A dependency may only have one source.

   ╷
30 │ ┌     sdk: flutter
31 │ │     date_format: ^1.0.8
32 │ │ 
33 │ │ # For information on the generic Dart part of this file, see the
34 │ │ # following page: https://dart.dev/tools/pub/pubspec
35 │ │ 
36 │ └ # The following section is specific to Flutter.
   ╵
pub get failed (65;    ╵)

报错主要就是导入的三方库名字没有与flutter_test对齐。有点坑 对齐过后就行了

dev_dependencies:
  flutter_test:
    sdk: flutter
    date_format: ^1.0.8

改为

dev_dependencies:
  flutter_test:
    sdk: flutter
  date_format: ^1.0.8