I have a small XML file which I am extracting XPath values to attributes from in EvaluateXPath 1.7.0. The XML is as follows: <?xml version="1.0" encoding="UTF-8"?> <sports-content path-id="general/l.sportsml.com.general/advisory/xt.pa.json.20180730123447-heartbeat"> <sports-metadata doc-id="xt.pa.json.20180730123447-heartbeat" date-time="2018-07-30T12:34:47+00:00" language="en-US" document-class="advisory" fixture-key="heartbeat" fixture-name="Heartbeat"> <sports-title/> <sports-content-codes> <sports-content-code code-type="publisher" code-key="padatasports.com" code-name="The Press Association"/> <sports-content-code code-type="distributor" code-key="xmlteam.com" code-name="XML Team Solutions, Inc."/> <sports-content-code code-type="sport" code-key="15000000" code-name="General"/> <sports-content-code code-type="league" code-key="l.sportsml.com.general" code-source="xmlteam.com" code-name="General"/> </sports-content-codes> </sports-metadata> </sports-content> The 3 attributes' XPath expressions are: string(/sports-content/sports-metadata/@date-time), string(/sports-content/sports-metadata/@doc-id), string(/sports-content/@path-id) The attributes are extracted properly but I am getting javax.xml.xpath.XPathExpressionException: Failure converting a node of class javax.xml.transform.sax.SAXSource: org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 1; Content is not allowed in prolog Thinking that there might indeed be unseen characters at the beginning or end of the file I looked at it using a hex viewer and found a control character at the end. I added in a ReplaceText node with (?s)^[^\<]*(<.*</sports-content>).*$ being replaced by $1 This worked to remove the control character but it did not get rid of the error message. As I said, I am able to get the attribute values I need, but I do not want to have my log filled with error messages, one for each flowfile. ... View more