Error - 12100

Document parse failure

Twilio was unable to parse the provided XML Document.

Your TwiML document must be a valid XML Document, or Twilio will not be able to read your document. You can debug XML parsing errors by getting the response body in the debugger, and then using an online validation tool like the W3C Validation Service.

Twilio's HTTP client does not support chunked transfer encoding. If your server responds to a request for TwiML with the HTTP header 'Transfer-Encoding: chunked' and your TwiML document is larger than the size of one chunk it will be truncated, which often results in a 12100 error. Dividing up large TwiML documents into smaller sections and using multiple <Redirect> verbs to route between them is the best way to get around this issue.

Possible Causes

• The root Response element is missing
• There is an unclosed element
• There is an unquoted attribute
• There is an improperly nested element

Possible Solutions

• Make sure your root element is <Response>
• XML is case sensitive, make sure your start and end elements match case. (Twilio elements begin with a capital letter)
• Make sure characters such as < > and & are escaped properly, as < > and &.