I am using Microsoft Reporting Services. When I added A subreport to my report i got the error "Subreport could not be shown" . I searched for the error I found lots of people saying that it was beacuse of the report perameters. To test this I added a blank report with just a textbox and I am still getting the error.
Normal reports ( i.e. wihtout subreports) are working for me OK.