Topic: Exporting as swf after changing bkground colour

Im trying to set the color of simpleviewer to a normal hex color in macromedia flash 8, after doing that, i try to export the file and i get this error message:
interface 'Stage Manager' could not be loaded.
var sm:StageManager = StgeManager.getInstance ();
Total ActionScript Errors: 1   Reported Errors: 1

I copied the simpleviewer.fla file onto another computer to work on it in MX..
Thanks for any help.