Parameter is missing a value ssrs 2008

Question

I have a parameter of integer datatype which is hidden. When i run the report, report gives me an error

Parameter X is missing a value

Answer 1

I had to do an "if exists" statement for this to go away. It worked for me because it makes it always return a value even if that value is not need by my query.

    if exists (my select query)
    my select query
    else 
    select '2' 
    // '2' would never be used, but it made ssrs stop giving me
    // the stupid error and execute the rest of the query