Your error says: xmldata: The content of elements must consist of well-formed character data or markup.
This indicates that the xmldata you are sending into your workflow is not properly created/formed (The input to the your Form Server Render Form Q-pac is not following specific standards).
According to
http://www.w3schools.com/xml/xml_dtd.asp: A "Well Formed" XML document is a document that conforms to the XML syntax rules that were described in the previous chapters:
* XML documents must have a root element
* XML elements must have a closing tag
* XML tags are case sensitive
* XML elements must be properly nested
* XML attribute values must always be quoted