Notice! This page describes the nature of the error using a hypothetical example and not the erroneous data of the input test file. You should however be able to apply this information to your error case.
Error description:
XML declaration misses the closing tag which is '?>'.
Example:
The correct format of XML declaration is:
<?xml version="1.0" encoding="UTF-8"?>
The error message given by the service:
"parsing XML declaration: '?>' expected"