Flutter Build Failed: "cannot find symbol" Error in File Picker & Other Plugins

Question

I am working on a Flutter project and facing a build error when trying to run it on an Android device. Below is my pubspec.yaml file:

environment:
  sdk: "3.7.0"

dependencies:
  flutter:
    sdk: flutter
  file_picker: ^6.2.1
  quill_html_editor: ^2.2.8

When I try to run my project using flutter run, I get the following errors:

Package quill_html_editor:android references quill_html_editor:android as the default plugin, but it does not provide an inline implementation.

Package file_picker:linux references file_picker:linux as the default plugin, but it does not provide an inline implementation.

/Users/mac/.pub-cache/hosted/pub.dev/file_picker-6.2.1/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:122: error: cannot find symbol
    public static void registerWith(final io.flutter.plugin.common.PluginRegistry.Registrar registrar) {
                                                                                 ^
  symbol:   class Registrar
  location: interface PluginRegistry

/Users/mac/.pub-cache/hosted/pub.dev/file_picker-6.2.1/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:251: error: cannot find symbol
            final PluginRegistry.Registrar registrar,
                                ^
  symbol:   class Registrar
  location: interface PluginRegistry
2 errors

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':file_picker:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

* 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 53s

┌─ Flutter Fix ───────────────────────────────────────────────────────────────────────────────────┐
│ [!] Consult the error logs above to identify any broken plugins, specifically those containing  │
│ "error: cannot find symbol..."                                                                  │
│ This issue is likely caused by v1 embedding removal and the plugin's continued usage of removed │
│ references to the v1 embedding.                                                                 │
│ To fix this error, please upgrade your current package's dependencies to latest versions by     │
│ running `flutter pub upgrade`.                                                                  │
│ If that does not work, please file an issue for the problematic plugin(s) here:                 │
│ https://github.com/flutter/flutter/issues                                                       │
└─────────────────────────────────────────────────────────────────────────────────────────────────┘
Error: Gradle task assembleDebug failed with exit code 1

Exited (1).

Steps I have tried:

1. Running flutter clean and then flutter pub get
2. Upgrading dependencies using flutter pub upgrade
3. Deleting the .pub-cache folder and reinstalling dependencies

Questions:

1. How do I resolve this error?
2. Is there an alternative to file_picker or quill_html_editor that works with Flutter 3.7.0?
3. Do I need to manually update some Gradle settings?

Any help would be greatly appreciated!

Answer 1

To ensure compatibility with Flutter 3.29 (Dart 3.7.0), you need to use file_picker version 8.3.6 or higher. The quill_html_editor package has not been updated for a long time and relies on an unsupported version of file_picker, so it needs an update as well. You might consider forking the repository and using one of the pull requests that addresses this issue.