A family of Microsoft relational database management systems designed for ease of use.
Hi There,
You most likely have a missing reference in your database. The article below shows how to check your references to see if any are missing:
ACC2000: You Are Prompted to Enter a Parameter Value for the Trim Function While Previewing a Mailing Label Report
http://support.microsoft.com/kb/283166/EN-US/
Hope this helps!
Kathy