Plugin problem - The import file does not match the user schema

i have openfire 3.3.2 installed on both my laptop and pc

the laptop was originally running wildfire - the pc is a fresh install of openfire dont know if this affects things?

i am trying to export all users over from the laptop to the pc - so i have created a new backup.xml file

the backup.xml file created - works when i try to reimport it to the laptop

but when i try to import the same xml file to the pc i get the error :: The import file does not match the user schema

i am using v 2.2.0 of the export/import plugin on both machines

any ideas why?

i have checked the xml file and it opens and closes with /Openfire