Error on Elastic Beanstalk while deploying a Github code using AWS Codepipeline

The error you're experiencing with your CodePipeline deployment to Elastic Beanstalk could be due to several reasons. Here are some steps you can take to troubleshoot and potentially resolve the issue:

1. Check the service role permissions: Ensure that the service role for CodePipeline has sufficient permissions for AWS Elastic Beanstalk. If the role was created before August 6, 2015, you may need to modify the policy statement to add the required permissions.

2. Review the deployment logs: Look for more detailed error messages in the Elastic Beanstalk logs. You can access these logs through the AWS Management Console or by using the EB CLI. The logs might provide more specific information about why the deployment is failing.

3. Verify the application package: Ensure that your application package is correctly structured and contains all necessary files. For example, if you're deploying a Java application, make sure there's a .jar file at the root level of your source bundle or a Procfile specifying how to run your application.

4. Check the buildspec.yml file: If you're using AWS CodeBuild as part of your pipeline, review your buildspec.yml file to ensure it's correctly configured to build and package your application.

5. Confirm environment compatibility: Make sure that the Elastic Beanstalk environment is compatible with your application's runtime and requirements.

6. Manually redeploy: Try manually redeploying the application version through the Elastic Beanstalk console to see if it works outside of the pipeline.

7. Review CodePipeline configuration: Double-check that the CodePipeline is correctly configured, including the input and output artifacts for each stage.

If you're still unable to resolve the issue after trying these steps, you may need to gather more detailed logs and potentially reach out to AWS Support for further assistance. They can help investigate the specific error you're encountering with your pipeline and Elastic Beanstalk deployment.
Sources
Troubleshooting CodePipeline - AWS CodePipeline
CodePipeline Deploy not working | AWS re:Post
Automated Elastic Beanstalk deployment of dotnet application fails on both CodePipeline and GitHub Actions, but works manually. | AWS re:Post
ElasticBeanstalk Deployment | AWS re:Post