This may mean that your user roles have been changed. In order to change roles or passwords on ScholarPack you do require the 'sysadmin' and 'Admin' User Role. To take the registers you require 'Teacher' role.
To check who has this in your school please go to Reporting > Reports > Staff (tab) > ScholarPack Users. If you no longer have this access you may need to speak to another administrator in your school who does have these roles in order to give you these back.