diff -r d5df428640ff -r ccf59c1f0b45 xmlclass/xmlclass.py
--- a/xmlclass/xmlclass.py	Thu Aug 17 15:43:25 2017 +0300
+++ b/xmlclass/xmlclass.py	Thu Aug 17 16:26:32 2017 +0300
@@ -1826,7 +1826,7 @@
             if class_idx is not None and class_idx < len(element_class):
                 new_element = element_class[class_idx]()
             else:
-                raise ValueError, "No corresponding class found!"
+                raise ValueError("No corresponding class found!")
         else:
             new_element = element_class()
         DefaultElementClass.__setattr__(new_element, "tag", self.DefaultNamespaceFormat % element_tag)