procedure or function expects parameter name which was not supplied

SQL 2008R2 - BIDS

I added an additional parameter to my SSRS Report.  I set it up identical to a couple other parameters already in the report.  I added the parameter to the dataset.  I added the parameter to the stored procedure and verified that it functions correctly in SSMS.

When I Preview the report I get the Procedure expects parameter error even though the parameter is in the parameter list with a value (0) assigned.

How can I make this work???