Error 21602
ERROR - 21602
Message body is required
You must specify content (text or media) for your message. The Body
OR MediaURL
parameter is required to send a Message with Twilio.
Possible Causes
You may have attempted to send a message without a Body
or MediaURL
parameter.
Possible Solutions
Retry your message including a body or a link to some media. For sample code that shows how to send an SMS message with Twilio's supported helper libraries, cURL, or the Twilio CLI, please see this short tutorial