Dataprocessor XML response format

I am starting to use the Dataprocessor for the grid (pro version). My server program is returning the following response:

The Dataprocessor debugger says the XML status is incorrect and that this is not valid XML. I’m not sure what is wrong with this XML data or why it is not considered valid XML format.

Thank you for your help.

DataProcessor expects that xml format will be without surrounding xml tag, similar to next one