Stored Procedure Not Accepting Integer Parameter

I have been using a Stored Procedure created by our DB guy, who happens to be out of town for the next week. The SP used to work, but before he left, the DB guy edited the SP, causing my code to throw a server error: "Column name or number of supplied values does not match table definition". He claimed before he left the SP should mainly be the same, so I'm at a loss for why it's no longer matching.

Here is the c# code:

    System.Data.SqlClient.SqlCommand objCmd = new 
    System.Data.SqlClient.SqlCommand("dci.webDonorStatistics", objConn);
    objCmd.CommandTimeout = 950;
    objCmd.CommandType = System.Data.CommandType.StoredProcedure;
    objCmd.Parameters.Add(new 
    System.Data.SqlClient.SqlParameter("@FiscalYear", 2018));
    GridView1.DataSource = objCmd.ExecuteReader();
    GridView1.DataBind();

Here is the declaration of the SP:

   ALTER PROCEDURE [dci].[webDonorStatistics] @FiscalYear INT
   AS
   BEGIN
    --DECLARE @FiscalYear INT = 2018

   DECLARE
   @StartDate DATE = CONVERT(DATE, '01-OCT-' + CONVERT(CHAR(4), @FiscalYear - 1))
   , @EndDate DATE = DATEADD(DAY, -1, GETDATE())

   IF @EndDate >= CONVERT(DATE, '30-SEP-' + CONVERT(CHAR(4), @FiscalYear))
    SELECT @EndDate = CONVERT(DATE, '30-SEP-' + CONVERT(CHAR(4), @FiscalYear))
    ELSE
     SELECT @EndDate = DATEADD(DAY, -1, CONVERT(DATE, '01-' + DATENAME(MONTH, GETDATE()) + '-' + CONVERT(CHAR(4), YEAR(GETDATE()))))  -- End of previous month

    IF DATEDIFF(DAY, @StartDate, @EndDate) < 0
    SELECT @EndDate = GETDATE()

    BEGIN TRY
     DROP TABLE #webDonorStatistics
    END TRY
    BEGIN CATCH
    END CATCH

Any help would be greatly appreciated. Thanks in advance.