Flutter Error on line 6, column 5 of pubspec.yaml: A dependency may only have one source. sdk: flutter ^^^^^^^^^^^^^

Question

I keep getting

Running "flutter packages get" in flutter_sportters...
Error on line 6, column 5 of pubspec.yaml: A dependency may only have one source.
    sdk: flutter
    ^^^^^^^^^^^^^

When I run my app or Packages Get .

It worked perfectly fine before. Have no idea how to fix this.

Answer 1

Consider you are going to use this package "shared_preferences".

You will get this error in pubspec.yaml. If you did like below.

dependencies:
 flutter:
  sdk: flutter
  shared_preferences: v0.4.2

Indention is important you are accidentally adding shared_preference package below flutter dependency. So the error "A dependency may only have one source"

Correct format below:

dependencies:
 flutter:
  sdk: flutter

 shared_preferences: v0.4.2 #no indention

Answer 2

It throws an error because of Indention . It is important to maintain Indention while adding a dependency in flutter.

Before :

dependencies:
  flutter:
    sdk: flutter

  cupertino_icons: ^0.1.2
  english_words: ^3.1.0

After :

dependencies:
  flutter:
    sdk: flutter

cupertino_icons: ^0.1.2
english_words: ^3.1.0

Hope this will solve your error. Happy coding!!!

Answer 3

Indentation !!! Being newbees making silly mistakes. I have written the new dependency inside the flutter root as :

dependencies:
  flutter:
    sdk: flutter
    sqflite: 

Instead of

dependencies:
  flutter:
    sdk: flutter
  sqflite: 

Comment when you see the difference!!

Answer 4

I was trying to add assets folder to my project. I added it under dependencies which caused the error:

dependencies:
  flutter:
    sdk: flutter
    assets:
      - images/

It's not to be added under dependencies . Instead, add it under flutter :

flutter:
  uses-material-design: true
  assets:
    - images/

Answer 5

You can define just like that in pubspec.yaml file

dependencies:
  flutter:
    sdk: flutter
  image_picker: 0.4.1

and flutter packages get you can call via terminal or if you are using Android Studio than options availbale above when you edit pubspec.yaml file.

In terminal go to your project directory and then enter flutter packages get

Answer 6

I solve My problem:

Here my first Code

dependencies
flutter:
    sdk: flutter
    webfeed: ^0.4.2

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^0.1.2

after I change it

dependencies:
  flutter:
    sdk: flutter

  webfeed: ^0.4.2

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^0.1.2

I thing you must to put your package name in the same number colunm of flutter: and cupertino_icons:

Answer 7

open your pubspec.yaml file

dependencies:
  flutter:
    sdk: flutter

  cupertino_icons: ^0.1.2
  country_code_picker: ^1.0.4

Answer 8

Other answers are correct. I would also like to add that I was trying to add shared_preferences and even though my indentation was correct, I was still getting the error mentioned in the question. To resolve it I changed the name of my project as it was also shared preferences

Answer 9

I kept getting this error no matter what I did, including commenting out the new lines. Finally, I put them back in with the correct indentation and ran the program. The problem magically resolved itself. However, the indentation is critical.

Answer 10

I am getting this error due to duplication of a package in dependencies ie: dependencies:

flutter: sdk: flutter

**cupertino_icons: ^0.1.2**
  english_words: ^3.1.5

# The following adds the Cupertino Icons font to your application. # Use with the CupertinoIcons class for iOS style icons.

cupertino_icons: ^0.1.2

I solved this error by removing duplication then Flutter clean and then Flutter Packages Get .

Answer 11

Its due to indentation: check out correct way

name: flutter_app description: A new Flutter application.

environment: sdk: ">=2.1.0 <3.0.0"

dependencies: flutter: sdk: flutter http: "0.11.3+17" autocomplete_textfield: ^1.6.4

dev_dependencies: flutter_test: sdk: flutter

flutter: uses-material-design: true

Answer 12

I ran into the same problem turns out the name of my app and the package name were same which resulted into this error.

name of the app scrapy and the dependency was also scrapy...

Changed the name and it worked.

Answer 13

After checking all other solutions if the problem still persists make sure whether the specified library is installed correctly or not. This error also encounter when the library is not installed correctly.

Answer 14

检查缩进，因为pubspec.yaml flutter 包采用单一依赖源。