A few not too distant internet years ago, I was among who had been extremely annoyed with this IE error in developing pages that had ActiveX content (like Flash movies).
Later browsers, (current IE7+) didn’t anymore encountered this error. But if you are among the few whose companies choose to stick with (Oh God..), IE6 here are some fixes I came upon.
1. Download the compatibility patch for IE here
http://www.microsoft.com/downloads/details.aspx?familyid=B7D9801B-4FB5-492E-903E-3400ABF1D731&displaylang=en or
2. If you are developing pages embedded with ActiveX content, Adobe Dreamweaver was kind enough in developing a javascript plug-in for making this error go away. Zip file attached.