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crystal report viewer Toolbar

I am developing reports on Crystal Reports XI R2, VS.NET 2005 , SQL Server 2000, C#.

When i run the report it generates the report fine but after a minute when I click on the toolbar either for print or export or drilldown or search or zoom or group tree or others i get a error

Database Logon Failed

Error in Crystal report viewer14

Object reference not set to an instance of an object

Any kind of help it is appreciated.

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