3.7.1 Object Library Not Registered (Macintosh OS X)
If you encounter an Object library not registered error message on Macintosh© OS X systems, your Microsoft Office© installation contains a corrupt library/preferences/Microsoft/Office Registration Cache X file. Open this file in a text editor, where you should remove all text and save it. Finish by locking this file and restarting the Microsoft Excel© application. The locking of this text file is most essential, otherwise the problem will re-occur.