Error Handling in Flutter - Gradle issue

The Error Message:-


Error: Could not find or load main class org.gradle.wrapper.GradleWrapperMain 
Caused by: java.lang.ClassNotFoundException: org.gradle.wrapper.GradleWrapperMain 
Exception: Gradle task assembleDebug failed with exit code 1 

This indicates a failure in building the Gradle project during the launch of the Dart file "lib/main.dart".

This error can be caused by several reasons including:

  • Incorrect Gradle version. 
  • Gradle build files are corrupted. 
  • Inconsistencies in the dependencies or build configurations. 
  • Java environment variables are not set correctly.

You can try the following steps to resolve the issue:

  • Update the Gradle version to the latest version. 
  • Delete the Gradle cache and restart the build process. 
  • Verify the dependencies and build configurations in the build.gradle file. 
  • Ensure the correct Java version is installed and set in the environment variables.

1. To update Gradle to the latest version, you need to modify the Gradle wrapper properties in the build.gradle file.

  • Step 1: Open build.gradle file in your project 
  • Step 2: Find the Gradle wrapper section, it should look like this:
task wrapper(type: Wrapper) {
   gradleVersion = 'x.x'
  • Step 3: Replace the version number x.x with the latest version number (check for the latest version)
  • Step 4: Save and close the file
  • Step 5: Run the command ./gradlew wrapper in the terminal to update the Gradle wrapper to the latest version.
  • Step 6: Finally, run ./gradlew clean build to build your project with the latest version of Gradle.

2. To delete the Gradle cache, follow these steps: 

  • Step 1: Go to the Gradle home directory, usually located in ~/.gradle
  • Step 2: Delete the cache folder 
  • Step 3: Restart the build process by running the Gradle command again.

3. To verify the dependencies and build configurations in the build.gradle file, follow these steps:

  • Step 1: Open the build.gradle file in your project.
  • Step 2: Check the dependencies section to ensure that all required dependencies are listed and their versions are correct.
  • Step 3: Check the build configuration section to ensure that all required configurations are set and their values are correct.
  • Step 4: Pay attention to the configuration of the repositories, to make sure that required dependencies can be resolved.
  • Step 5: If everything looks fine, then save and close the file. If not, make the necessary changes and then save and close the file.
  • Step 6: Finally, run ./gradlew clean build to build your project with the updated build.gradle file.

4. To ensure the correct Java version is installed and set in the environment variables, follow these steps:

  • Step 1: Check the Java version by running the command java -version in the terminal.
  • Step 2: If the installed Java version is not the desired one, download and install the correct version from the official website (
  • Step 3: Set the JAVA_HOME environment variable to the location of the Java installation. On Windows, this can be done by adding a new system variable, and on Linux/macOS, by adding a new line to the ~/.bashrc or ~/.bash_profile file.
  • Step 4: Restart the terminal or log out and log in again to reload the environment variables.
  • Step 5: Verify that the correct Java version is set by running java -version again.
  • Step 6: Finally, run ./gradlew clean build to build your project with the correct Java version.

ABD/Emulator Issues:

Error Message

adb: failed to install "------" Error launching application on AOSP on IA Emulator.

Above Error message suggests that there was a problem installing the app APK file using the Android Debug Bridge (adb) tool on an Android Emulator. 

Some common causes of this issue include:
  • Incorrect emulator setup: Make sure the emulator is set up correctly and is running the correct version of Android.
  • Incompatible APK file: Ensure the APK file being installed is compatible with the emulator's Android version.
  • adb connection issue: Check that the adb connection to the emulator is working properly.
  • Insufficient emulator storage: Make sure the emulator has enough storage space to install the app.

Some common error messages you might encounter while running a Flutter app in Visual Studio Code could be related to a number of issues, including:

  • Incorrectly set Flutter SDK path
  • Outdated Flutter plugins or packages
  • Inconsistencies in the dependencies or project configurations
  • Incompatibility between the Flutter version and the project
  • Issues with the Dart SDK

To resolve the issue, you can try the following steps:

  • Verify that the Flutter SDK path is correctly set in the Visual Studio Code settings.
  • Upgrade the Flutter plugins and packages to the latest version.
  • Check the dependencies and configurations in your pubspec.yaml file and fix any inconsistencies.
  • Make sure that the Flutter version you're using is compatible with the project.
  • Ensure that the Dart SDK is installed and configured correctly.

You might get an error post updating the new version of Flutter, for that cases you can refer below solution to fix that issue:

The error messages may indicate that there are outdated packages in your Flutter project after upgrading to Flutter 3.7.0. You can resolve this error by updating the outdated packages to their latest available versions by running the following command in your terminal:
flutter pub upgrade

This will update all the packages listed in your pubspec.yaml file to their latest available versions.


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