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AWS Polly InvalidParameterValueException

One or more parameters in the request are invalid.

Understanding AWS Polly

AWS Polly is a service provided by Amazon Web Services that turns text into lifelike speech. It enables developers to create applications that can 'speak' in a natural and engaging way. Polly supports a wide range of languages and voices, making it a versatile tool for various applications, from accessibility solutions to interactive voice response systems.

Identifying the Symptom

When using AWS Polly, you might encounter the InvalidParameterValueException error. This error typically manifests when a request to the Polly API fails due to invalid parameters. You may see an error message indicating that one or more parameters in your request are not valid.

Common Scenarios

This error often occurs when parameters such as the language code, voice ID, or text input do not conform to the expected format or values. It is crucial to ensure that all parameters are correctly specified according to the AWS Polly documentation.

Explaining the Issue

The InvalidParameterValueException is a client-side error that indicates a problem with the request parameters. AWS Polly requires specific parameters to be set correctly, and any deviation from the expected values can result in this error. For example, using an unsupported language code or an incorrect voice ID can trigger this exception.

Parameter Validation

Each parameter in the Polly API request has specific requirements. For instance, the LanguageCode must match the supported languages, and the VoiceId must be valid for the chosen language. Refer to the AWS Polly API Reference for detailed parameter specifications.

Steps to Fix the Issue

To resolve the InvalidParameterValueException, follow these steps:

Step 1: Review API Documentation

Begin by reviewing the AWS Polly Documentation to understand the correct parameter values. Ensure that your request parameters align with the documented specifications.

Step 2: Validate Parameters

Check each parameter in your request:

  • LanguageCode: Verify that the language code is supported by AWS Polly.
  • VoiceId: Ensure the voice ID is valid for the selected language.
  • Text: Confirm that the text input is within the allowed character limit and format.

Step 3: Test with Sample Requests

Use sample requests from the AWS Polly documentation to test your setup. Modify your parameters based on successful sample requests to identify any discrepancies.

Step 4: Debugging and Logging

Implement logging in your application to capture detailed error messages. This can provide insights into which parameter is causing the issue. AWS CloudWatch can be used to monitor and log API requests.

Conclusion

By carefully reviewing and validating your request parameters, you can resolve the InvalidParameterValueException in AWS Polly. Ensure that all parameters conform to the API's requirements, and utilize AWS resources for troubleshooting. For further assistance, consider reaching out to AWS Support.

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