Too many TwiML reply messages have been sent in response to a single incoming message. You can send a maximum of 10 TwiML replies per incoming message.
Possible Causes
A runaway loop or other error in your application generated more than 10 TwiML replies to a single incoming message
You have attempted to send >10 TwiML replies to a single incoming message
Possible Solutions
If you need to generate >10 outbound messages for one incoming message, please use new API requests to create these messages.