I am getting an error when trying to create a workbook. I have attached the error stack from the debug screen. This is the first time I have run into this issue and I think it may have something to do with the recent upgrade to Microsoft Office 2010 and I'm now trying to read .xlsx files where before I was reading .xls files. As such, it might mean I need some different jars. If so, how do I go about adding them to the application. As always, any help is greatly appreciated.