The page could be laded in different frames
No, that won't cause this error, sorry. ASP doesn't know what a frame is,
and each ASP page loaded into a frameset is independent of the others and
doesn't even know they exist.
But perhaps you are getting a popup error in Internet Explorer; that would
be a different issue altogether. It's hard to tell from your original
one-line post, that doesn't contain the EXACT error, its context, or ...
heaven forbid ... any code to try and help us reproduce the problem.
Some basic debugging and a better description of what's really going on
might help here... otherwise we're all just chasing your tail and vague
narrative...