I have a report consisting of 3 subreports. The report was working fine several days ago. I have been working to add new data to the report from a different database. Actually a spreadsheet saved as a dbf file.

 

I can see all the subreports in preview, but when I try to preview the main report to include all the subreports, I get an invalid argument error.

 

The report will eventually be kicked off using a 3rd party application but the report fails on that as well.

 

Any thoughts? I dont really know where to begin troubleshooting.