I found a solution for this problem!!!. You have to update the Report Viewer control to the SP1 version. If you want to update the control, enter this links:

Microsoft Report...

Thanks for the suggestion Jack, it solve my problem perfectly! I didn't know that you have to give access in the Report Manager by the Propieties Label, but it is...

Jack Corbett (7/16/2008)

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You need to give the users rights to the report server. You can do this using report manager or SSMS. In report manager you need to...