Cannot create a connection to data source

I installed the SQL Server 2005 June CTP. I created a datasource named Datawarhouse. I went into the Report Builder and created a report and could actually run the report successfully. When I saved the report & ran it I got the following error: An error has occ

urred during report processing.

Cannot create a connection to data source 'Datawarehouse'.

For more information about this error navigate to the report server on the local server machine, or enable remote errors. I am not sure what I am doing wrong. Why don't it find the data source? Any help would be appreciated.

Thanks! JohnAre you using stored credentials for the connection or integrated security? If you try to run the report on the server locally, you should get more information about the error.