SSRS Report Error "Parameter is missing a value"

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I was start getting error "Parameter is missing a value" when i left blank parameter of report. To make report parameter optional you have to follow these steps.

1. Open report in Visual Studio.

2. Go to Parameters and open the properties of your parameter.


 

3. Set Allow Blank to true.

4 Set Nullable to true.

5. Build and deploy the report.

6. In AOT, goto SSRS report and right click on your report and select Deploy Element.

7. Run your report.

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