I'm not sure if its causing your specific problem, but your property elements do not denote the type of the column/member. Try something like..
Code:
<property name="name">
<column name="NAME" type="string"/>
</property>
And so forth for the other properties.
The exception you are getting seems to indicate that the XML parser does not recognize the
return-property tag. I've never built SQL into my mappings, so I'm unfamiliar with the process, but it looks like the tag is undefined. If you are simply trying to read all the elements of the table and are not required to build this into the mapping file for some reason, you can easily use HQL for that...
"from Login"
John