Resolution
----------

The **Configuration validation exception** error occurs for the following reasons:

*   The configuration for an Amazon Machine Image (AMI) in the Elastic Beanstalk environment is incorrect.
*   A custom AMI that's referenced in the environment is deleted from the account.

To resolve this error, complete the following steps:

1. [Create a new custom AMI](https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features.customenv.html#using-features.customenv.create).
2. [Install AWS Command Line Interface (AWS CLI) on your local machine](https://docs.aws.amazon.com/cli/latest/userguide/getting-started-install.html).
3. To update the Elastic Beanstalk environment with the new AMI ID, run the [update-environment](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/elasticbeanstalk/update-environment.html) command:
    ```plaintext
    aws elasticbeanstalk update-environment --environment-name env_name --option-settings Namespace=aws:autoscaling:launchconfiguration,OptionName=ImageId,Value=ami_id --region region_id
    ```
    **Note:** Replace **env\_name** with your environment name, **ami\_id** with your AMI ID, and **region\_id** with your AWS Region.

**Note:** If you receive errors when you run AWS CLI commands, then see [Troubleshoot AWS CLI errors](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-troubleshooting.html). Also, make sure that [you're using the most recent AWS CLI version](https://docs.aws.amazon.com/cli/latest/userguide/getting-started-install.html).

When I update my AWS Elastic Beanstalk environment, I encounter the following error: "Configuration validation exception: Unable to look up root device name for image ami-1234abcd". I want to resolve this error so that I can make changes to my environment.

Resolve Configuration validation exception error in Elastic Beanstalk

How do I resolve the "Configuration validation exception" error in Elastic Beanstalk?

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How do I resolve the "Configuration validation exception" error in Elastic Beanstalk?

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