Thank you for contacting us.
Please, let me know if you receive this error while using Store Manager, or when you are trying to use URI (SEO) Module?
Our company, eMagicOne, develops and supports Store Managers and addons only, if your questions is related to modules, you can check it with MagneticOne support team:
http://magneticone.com/store/
http://support.magneticone.com/