Bi Publisher and Excel Template Invalid UTF8 encoding Error

Hello,

I am a PeopleSoft developer and using an excel template for the first time with BI Publisher. I am creating the data for an XML File in an Ap Engine, and calling the file using &xmlFile = GetFile(&sFName, "W", "UTF8", %FilePath_Absolute);  The XML File loads in the Excel BI Publisher template, and previews fine, but when I create the Data Source and Report Definition online, and try to preview it, or call it in the AE, I get Invalid UTF8 encoding Error. The same XML works fine in the Report Definition if I use it in a .rtf