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Warning 12200

WARNING - 12200

Schema validation warning

The provided XML does not conform to the Twilio Markup XML schema. Please refer to the specific error and correct the problem. ## Warning - 12200

Schema validation warning

The provided XML does not conform to the Twilio Markup XML schema. Please refer to the specific error and correct the problem.

Possible Causes

  • Misspelled verbs
  • Incorrect case for verbs; TwiML is case-sensitive, so <Say> works, but <say> will not
  • Misspelled or unknown attributes
  • Unknown or unexpected nested elements.

Possible Solutions

  • Check the line and column reported by the warning to see what part of your XML response caused the complaint
  • Verify that your application server is accepting and properly responding to any custom parameters you may be passing
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