--- "@context": https://schema.org "@type": TechArticle "@id": https://www.twilio.com/docs/api/errors/12100#article headline: "12100: Document parse failure" url: https://www.twilio.com/docs/api/errors/12100 inLanguage: en dateModified: 2026-03-11T18:38:39.000Z author: "@type": Organization name: Twilio Developer Education Team publisher: "@type": Organization name: Twilio --- # 12100: Document parse failure Log Level: ERROR ## Description 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](/user/account/debugger), and then using an online validation tool like the [W3C Validation Service](http://validator.w3.org/#validate_by_input). ### Possible causes * There is a leading space, or an empty line, before the XML type header (i.e. ``) * The root `` element is missing * There is an unclosed element * There is an unquoted attribute * There is an improperly nested element ### Possible solutions * Make sure there is no extra space or line at the beginning of the file before the type header * Make sure your root element is `` * 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 &`.