Fix InvalidKeyError

✅ Solution

The "InvalidKeyError" in vonage-sdk usually arises from improperly configured or missing API credentials, specifically your API key, API secret, or application ID and private key for JWT authentication. To resolve this, double-check that your Vonage API key, API secret, application ID and private key file path are correctly set as environment variables or directly in your code, and ensure the private key is valid and not corrupted. Regenerate your key/secret or private key in the Vonage API dashboard if necessary, then update your configuration in your application accordingly.