You must recreate your shops, if you are using mysql you must recreate database. It's last saving migration i hope. :)

• Migrated from flat file to Sqlite (sorry for no converter)
• Added complex serializer for shops(enchantments,potions,heads support), (big thanks for Me4502)
• Cleaned up database structure
• Fixed "Enchanted Book not displaying enchantments"
• Added debug mode
• Added new permissions
• Cleaned up code a lot
• Added /fs save command
• Added 1.6.1 blocks and items support