Sounds like you must be using an outdated version of Music Maker that still uses the old/regular MAGIX copy-protection system ("Protein"). Otherwise, you wouldn't be able to receive this kind of error message. Possibly, that version isn't even fully suitable for your current OS. More details on your version and the problem context might be helpful. However, you should also check out the information in the following post on how to perform a free upgrade to a current Music Maker generation:
Depending on the problem specifics, this might very well be a simple solution to your issue. If "Bass Machine" was bundled with your old version, the entry of that version's serial number will unlock "Bass Machine" via the in-app store system and enable you to use it in the current version.