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AWS Polly LexiconNotFoundException

The specified lexicon does not exist in the AWS account.

Understanding AWS Polly

AWS Polly is a cloud service that converts text into lifelike speech. It enables developers to create applications that can talk, making it an essential tool for voice-enabled applications. Polly uses advanced deep learning technologies to synthesize speech that sounds like a human voice.

Identifying the Symptom: LexiconNotFoundException

When using AWS Polly, you might encounter the LexiconNotFoundException error. This error typically occurs when a specified lexicon is not found in your AWS account. Lexicons are used to customize the pronunciation of words, and if Polly cannot locate the lexicon, it will throw this exception.

Understanding the Issue: LexiconNotFoundException

The LexiconNotFoundException is an error code indicating that the lexicon you are trying to use does not exist in your AWS account. This could be due to a typo in the lexicon name, or the lexicon might not have been uploaded to your account. For more details on AWS Polly lexicons, you can refer to the AWS Polly Lexicon Management documentation.

Steps to Fix the LexiconNotFoundException

Step 1: Verify Lexicon Name

Ensure that the lexicon name you are using in your application matches exactly with the name of the lexicon uploaded to AWS. Lexicon names are case-sensitive, so double-check for any discrepancies.

Step 2: Check Lexicon Upload

Log into your AWS Management Console and navigate to the Polly service. Under the 'Lexicons' section, verify that the lexicon you intend to use is listed. If it is not, you will need to upload it. You can find instructions on how to upload a lexicon in the AWS Polly Lexicon Upload Guide.

Step 3: Upload the Lexicon

If the lexicon is missing, you can upload it using the AWS CLI with the following command:

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

Ensure that the file path and lexicon name are correct.

Step 4: Test the Lexicon

After uploading, test the lexicon by synthesizing speech using the AWS CLI:

aws polly synthesize-speech --output-format mp3 --voice-id Joanna --text "Hello, world!" --lexicon-names YourLexiconName output.mp3

Listen to the output file to ensure the lexicon is applied correctly.

Conclusion

By following these steps, you should be able to resolve the LexiconNotFoundException error in AWS Polly. Always ensure your lexicon names are correct and uploaded to your AWS account. For further assistance, refer to the AWS Polly Documentation.

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