Gradle Build Error: Unable to Find Tasks - Troubleshooting Guide

This message usually appears when Gradle cannot find any tasks to execute in the specified build mode. In this case, the build mode is set to 'ASSEMBLE', which typically means that only the main source code will be compiled and packaged into the final artifact (e.g., JAR or APK file).

The message also indicates that no tests are found. This could be due to the absence of any test files or the configuration of the build system not including them in the build process.

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

1. Check your project's structure and ensure that the necessary source code and test files are present. Verify that the file paths and naming conventions are correct.

2. Make sure that the build.gradle file in your project's root directory includes the necessary configurations for building and testing your project. Specifically, check for the presence of the buildTypes and testOptions sections. Additionally, ensure that the source and test directories are correctly specified.

3. If you are using Android Studio, try syncing your project with Gradle by selecting the 'Sync Project with Gradle Files' option from the 'File' menu. This action will refresh the project configuration and dependencies.

4. If you are using a command-line interface, try running the Gradle command gradlew clean build to clean the project and rebuild it from scratch.

5. If none of the above steps work, consider checking for any custom Gradle plugins or scripts that might interfere with the build process. Temporarily disable them to see if they are causing the issue.

If you are still unable to build your project after trying these steps, please provide more information about your project setup, the contents of your Gradle files, and any error messages or warnings you encounter.