It's possible that:
* There is a typo in the name. Double check the spelling.
* Don Carter is not a well-known figure in the entertainment industry. This could be due to a variety of factors, such as working primarily in niche genres or having a smaller body of work.
* The information is outdated. It's possible that Don Carter was involved in film or television in the past but is no longer active.
If you can provide more details, such as the approximate year of the project or a description of his role, it might be easier to identify the person you're looking for.