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AWS Polly InvalidLexiconException

The lexicon provided is not valid.

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 talk, making them more engaging and accessible. Polly uses advanced deep learning technologies to synthesize speech that sounds like a human voice.

Recognizing the Symptom: InvalidLexiconException

When using AWS Polly, you might encounter the InvalidLexiconException. This error typically occurs when there is an issue with the lexicon you are trying to use. The symptom is usually an error message indicating that the lexicon is not valid.

What You Might Observe

When this exception is thrown, your application may fail to synthesize speech as expected, and you will receive an error message detailing the issue with the lexicon.

Details About the InvalidLexiconException

The InvalidLexiconException is an error code that indicates the lexicon provided to AWS Polly is not valid. A lexicon is a file that contains a list of words and their pronunciations, which Polly uses to improve the accuracy of speech synthesis. The lexicon must adhere to the Pronunciation Lexicon Specification (PLS).

Common Causes

This error often arises from syntax errors in the lexicon file, such as missing tags, incorrect nesting, or non-compliance with the PLS standard.

Steps to Fix the InvalidLexiconException

To resolve this issue, follow these steps:

1. Validate Your Lexicon

Ensure that your lexicon file is well-formed and adheres to the PLS specification. You can use XML validators like XMLValidation to check for syntax errors.

2. Check for Common Errors

Review your lexicon for common issues such as:

  • Missing or mismatched tags
  • Incorrect attribute values
  • Non-standard phonetic alphabets

3. Use AWS Documentation

Refer to the AWS Polly Lexicon Documentation for detailed guidelines on creating and using lexicons.

4. Test Your Lexicon

After making corrections, test your lexicon by uploading it to AWS Polly and synthesizing speech. Use the AWS CLI or SDKs to perform these tests:

aws polly put-lexicon --name YourLexiconName --content file://your-lexicon-file.pls

If the lexicon is valid, Polly will accept it without errors.

Conclusion

By ensuring your lexicon is correctly formatted and adheres to the PLS specification, you can resolve the InvalidLexiconException and improve the performance of your AWS Polly applications. For further assistance, consider reaching out to AWS Support or consulting community forums like Stack Overflow.

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