How to solve duplicate classes issue for Flutter?

Question

after adding

location: ^1.4.1

to my dependencies in pubspec.yaml:

dependencies:
  flutter:
    sdk: flutter

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^0.1.2
  rxdart: ^0.20.0
  http: ^0.12.0
  date_format: ^1.0.5
  intl: ^0.15.7
  fluttertoast: ^2.2.3
  location: ^1.4.1

I do Packages get, and everything is fine, but when I try to build it, the app crashes with a message:

Launching lib\main.dart on Lenovo K33a48 in debug mode... Initializing gradle... Resolving dependencies... Gradle task 'assembleDebug'... D8: Program type already present: android.support.v4.app.INotificationSideChannel

FAILURE: Build failed with an exception.

• What went wrong: Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForDebug'.

  com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: "Here goes the list of all jar archives" Learn how to resolve the issue at https://developer.android.com/studio/build/dependencies#duplicate_classes. Program type already present: android.support.v4.app.INotificationSideChannel

• Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

BUILD FAILED in 18s Finished with error: Gradle task assembleDebug failed with exit code 1

My targetSdk is 28. I use Android Studio 3.2.1 Help would be very much appreciated!

Answer 1

this happens because the library you are using uses the same dependences.

SOLUTION 1

1. in VSCode Search (Ctrl+Shift + P)
2. in your error android.support.v4.app.INotificationSideChannel. search for keywords Notification/Side/Channel. pick one.
3. If there are the same dependences, it means that there are duplicate libraries.
4. Solution: Delete one of the libraries you are using

SOLUTION 2 (Recommended)

1. in VSCode Search (Ctrl+Shift + P)
2. in your error android.support.v4.app.INotificationSideChannel. search for keywords Notification/Side/Channel. pick one.
3. Find a library that uses the same dependences, then update to the latest package version.
4. This solution will keep the library you are using without deleting it