Check names of user-defined groups and roles
If any of the user-created groups or roles have the same name as any system-defined roles, change these group or role names before upgrade. If any user-created groups or roles have the same name as a system-defined role, problems can occur when you upgrade.
For example, if a user-created group or role is named "Admin," you should change the name, as this is the name of a system-defined role used in Campaign.