Execute xPath Action - Returns "Content Not Allowed In ProLog"

Document ID : KB000072694
Last Modified Date : 07/03/2018
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Issue:
Using the action "Execute an XPath query" returns Exception occurred: Content is not allowed in prolog.
Environment:
CA Release Automation 6.x
Cause:
The "XML File Path" field is pointing to a directory. 
Resolution:
Point the "XML File Path" field to a valid XML file.