13336: Gather: Invalid debug value

Twilio sends this warning when <Gather> receives an invalid debug value. Set debug to true or false.

• debug is set to a value other than true or false.

• Set debug to true or false in your <Gather> TwiML, or remove the attribute.
• Review the <Gather> request and TwiML to confirm the value Twilio received.

• TwiML Voice: <Gather>
• Debugging Your Twilio Application