FIX: Error message when you display a parameterized report in a Report Viewer Web part in SQL Server 2005 Reporting Services: "Object reference not set to an instance of an object"
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Source: Knowledge Base
Product: Microsoft SQL Server 2005 Reporting Services
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FIX: Error message when you display a parameterized report in a Report Viewer Web part in SQL Server 2005 Reporting Services: "Object reference not set to an instance of an object"
http://support.microsoft.com/kb/942530/en-US