There's not a lot to go on here. It would be nice if you would provide more information. For example what is your setup? how is the VI being called? maybe a screenshot of how you are calling the VI from TestStand? Etc...
In any case it looks to me like you are trying to parse a file that is not XML. If I were you I would open this VI directly: http://zone.ni.com/reference/en-XX/help/371361P-01/glang/xml_load_document/ And browse the file you think you are supposed to be parsing. Run it and see if you get the error. If you do then you know the file isn't compatible with the LabVIEW XML parser.
