Hi:
When you use the ExcelXP tagset, you are creating Spreadsheet Markup Language XML -- which is the Microsoft definition (in XML format) for a workbook/worksheet. Generally, this error means that the XML that you are generating is not recognized by Excel as being valid. This kind of error is generally a signal that you need to download the newest (updated) version of the ExcelXP tagset. Tech Support can help you figure out how to do this. Or, you can read about the various versions of the tagset at this site:
http://support.sas.com/rnd/base/ods/odsmarkup/excelxp_help.html
and then decide which one you want to download from here:
http://support.sas.com/rnd/base/ods/odsmarkup/ (scroll down to the middle of the page and look for ExcelXP)
If you are using the most updated version of the tagset and you are still getting this message, then you should contact Tech Support for help in figuring out how to generate valid XML for Excel.
cynthia