I got this message checking CB Tools Manager after upgrading to 1.3 and then instantly upgrading to 1.3.1.
In order for CB to function properly a Joomla/Mambo menu item must be present. This menu item must also be published for PUBLIC access. It appears that this environment is missing this mandatory menu item. Please refer to the section titled "Adding the CB Profile" of the PDF installation guide included in your CB distribution package for additional information regarding this matter.
I do have a published public registration form. See below
www.thejungle.uk.net/jungle-explorer-members/become-a-member.html