Pivot Table Unable to display information....HELP....

Anyone out there ... I'm creating a pivot table in XP,
and others are trying to view it in Excel 2000.
Unfortunately there is a wonderful error that is occuring
and have no idea how to figure it out. I get the
following:

"Microsoft Excel cannot make this change because there
are too many row or column items. Drag at least one row
or column field off the pivot table or to the page
position. Alternatively right click the field and then
hide or hide levels on the short cut menu."

Anyone?.. Help?...

thanks,