Twilio's platform encountered an internal error while processing this message.
Possible Causes
If this message was being processed during an incident, it is possible that this message was affected. See Twilio's status page for ongoing and historical incidents.
There was an unrecoverable anomaly that occurred while processing this particular message.
Possible Solutions
Try sending the message again.
If the subsequent attempt also fails with this error, contact support referencing the affected Message Sids for further troubleshooting.