21619: A Message Body, Media URL or Content SID is required

A Message Body, Media URL or Content SID is required

You are sending a message using a Messaging Service without specifying a Body,Media URL or Content SID.

• Ensure you are specifying the correct API Parameters when sending your message.
• If you are using Content Templates, you need to specify a Content SID, otherwise you will need to send a "Body" and/or "Media URL".