SSRS 2008: error message saying my parameter doesn't exist but it clearly does?

Question

I have a report that has about 10 parameters and about 10 datasets and one datasource. I typed alot but I really need help so I figured I would try and provide as much info

Answer 1

This could mostly be due to the parameter name not being updated in the dataset.

This article helped me resolve it

When editing Parameters (names or case) for a Dataset within SSRS you may encouter the previous error message when you preview the report. While on the surface it may appear that the parameter has the same case in the Parameter settings and the Dataset query – there is another place where a change is required.

1. Open the Dataset properties for the Dataset (s) that use the Parameter in the error message.
2. Select the Parameters property in the left list pane.
3. Click the Expression Editor button for the specified Parameter.

4. Here you will notice that the Expression is underlined in red. This is where you will need to correct the case of the Parameter name.