can you test if it works without the date parameter?
Also have a look at the links below
http://social.msdn.microsoft.com/Forums/en/sqlreportingservices/thread/7ad47b7e-b5ad-4794-8fee-f36820c10254
http://connect.microsoft.com/SQLServer/feedback/details/648560/subreport-with-shared-dataset-throws-error
If you are not able to solve the issue, can you send the reports to jason143@gmail.com so that I can have a look?
commented on Apr 10 2012 1:00PM