The value you are entering in the parameter does not exactly match the data in the export you are looking to match it to.  Enter the value exactly as it appears in the exported data.

For example, if you are entering a value for Class Of that is a 4 digit number in the prompt, make sure that the Class Of year you're looking to filter on in the data is being exported as 4 digits instead of 2.

In Crystal Reports, check to make sure the criteria in the Select Expert is correct.