Resolving org.gradle.execution.TaskSelectionException: Task ‘:wrapper’ not found in project app with Gradle

The error org.gradle.execution.TaskSelectionException: Task 'wrapper' not found in project ':app' occurs in Gradle projects when the wrapper task is not defined in the build.gradle file of the specified project. This task is typically used to generate Gradle wrapper files, which are essential for ensuring consistent Gradle versions across different environments. To resolve this, you need to add the wrapper task to your build.gradle file.

Common Causes

Here are some common causes for the org.gradle.execution.TaskSelectionException: Task 'wrapper' not found in project ':app' error:

1. Missing Wrapper Task in build.gradle: The wrapper task might not be defined in your build.gradle file. Ensure you have the following block in your root project’s build.gradle:

   task wrapper(type: Wrapper) {
       gradleVersion = '7.0'
   }
   

2. Running the Command in a Subproject: The wrapper task is typically defined in the root project. If you run the command from a subproject directory, it won’t find the task. Navigate to the root project directory and run the command again.

3. Deleted or Moved Wrapper Script: The gradlew script or the gradle directory might have been deleted or moved. Ensure these are present in your project root.

4. Renamed Project Directory: If the project directory has been renamed, the paths might not align correctly. Verify that the directory structure matches the expected configuration.

5. Gradle Version Compatibility: Ensure that the Gradle version specified in the wrapper task is compatible with your project setup.

These steps should help you resolve the error.

Step-by-Step Troubleshooting

Here’s a step-by-step troubleshooting guide:

1. Open build.gradle File:

   • Navigate to your project’s root directory.
   • Open the build.gradle file.

2. Check for wrapper Task:

   • Look for the wrapper task in the build.gradle file.
   • If it’s missing, proceed to the next step.

3. Add wrapper Task:

   • Add the following code to your build.gradle file:

     task wrapper(type: Wrapper) {
         gradleVersion = '7.0' // or your desired Gradle version
     }
     

4. Save and Close:

   • Save the changes and close the build.gradle file.

5. Run the Wrapper Task:

   • Open your terminal or command prompt.
   • Navigate to your project’s root directory.
   • Run the command:

     ./gradlew wrapper
     

6. Verify:

   • Ensure the gradle-wrapper.properties file is generated or updated in the gradle/wrapper directory.

7. Rebuild Project:

   • Rebuild your project to check if the error is resolved.

This should help you resolve the ‘task wrapper not found’ error.

Best Practices

Here are some best practices to prevent the org.gradle.execution.TaskSelectionException: Task 'wrapper' not found in project ':app' error in future Gradle projects:

1. Consistent Project Structure: Ensure that your project structure is consistent and follows Gradle conventions. The wrapper task should be defined in the root project, not in subprojects.

2. Define Wrapper Task: Explicitly define the wrapper task in your root build.gradle file if it’s missing. Add the following snippet:

   task wrapper(type: Wrapper) {
       gradleVersion = '7.0'
   }
   

3. Run Commands from Root Directory: Always run Gradle commands from the root project directory to ensure that the wrapper task is accessible.

4. Check Task Availability: Use gradle tasks to list all available tasks and verify that the wrapper task is listed.

5. Use Absolute Task Path: When running tasks from subprojects, use the absolute task path (e.g., :wrapper) to ensure the task is correctly referenced.

Implementing these practices will help maintain a smooth Gradle build process and avoid common errors.

The ‘org.gradle.execution.TaskSelectionException: Task ‘wrapper’ not found in project ‘:app” Error

The ‘org.gradle.execution.TaskSelectionException: Task ‘wrapper’ not found in project ‘:app” error occurs when the wrapper task is missing from the build.gradle file.

To resolve this, add the wrapper task to your build.gradle file with the correct Gradle version specified. Ensure that the wrapper task is defined in the root project and not in subprojects.

Running commands from the root directory and checking task availability can also help prevent this error.

Proper Gradle configuration is crucial for a smooth build process.