What does it mean when my Gradle Build fails while attempting to run HelloCardboard on Android using Unity 2021.3.18f1?

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When the Gradle build fails while attempting to run HelloCardboard on Android using Unity 2021.3.18f1, it typically means that there is an error in the code or configuration that prevents the project from being built and executed. This error could be due to a variety of factors, such as missing dependencies, incorrect SDK versions, or syntax errors in the code. To fix the issue, you may need to review the error message provided by the build, identify the cause of the error, and then make the appropriate corrections to your project code or configuration.