There is a conflict with 'xml_marshaller' name.

it can be both the module or relative module.
This is a patch to workaround this issue.

src/xml_marshaller/xml_marshaller.py

@@ -360,7 +360,10 @@ class Unmarshaller(ElementTreeContentHandler):
 
   # find_class() is copied from pickle.py
   def find_class(self, module, name):
+    try:
       module = __import__(module, globals(), locals(), [''])
+    except ImportError:
+      module = __import__(module, {}, locals(), [''])
     return getattr(module, name)