A number of problems:
1. You need an 'AJAX: On completed' event so
[1]System: On start of layout
AJAX: Request project file
[2]AJAX: On completed
XML: Load document from AJAX.LastData
2. Load XML document from string AJAX.LastData (not "AJAX.LastData"... no quotation marks)
3. In the XML file: version="1.0" (you shouldn't have double quotation marks)
4. Make sure tag names match: <Actor></Actors>, <Monster></Monsters>