Crystal Report doesn't show data when generated

Hi! I have a problem with crystal report. When I generate it on runtime, it doesn't show any data. But it does when I check on the 'Main Report Preview' of VS 2010. I have also checked my stored procedure, it does produce data when I execute it. What seems to be the problem?

The are no errors showing up. The crystal report just doesn;t show anyhting, only my headers. Please help, thanks! :)

Here is my stored procedure:

ALTER PROCEDURE [dbo].[GenerateOrgPlanningReport]
(

	  @HP VARCHAR(100) = NULL
	, @FTW VARCHAR(100) = NULL
	, @LocalSupervisor VARCHAR(100) = NULL
	, @JobLevel VARCHAR(100) = NULL
	, @JobType VARCHAR(100) = NULL
	, @Positions VARCHAR(100) = NULL
	, @Divisions VARCHAR(100) = NULL
	, @Gender VARCHAR(100) = NULL
	, @YrOfUpdateFROM VARCHAR(100) = NULL
	, @YrOfUpdateTO VARCHAR(100) = NULL
	, @EmployeeName VARCHAR(100) = NULL
	
)
AS BEGIN
SELECT
	Emp.FirstName + ' ' + Emp.LastName AS EmployeeName,
	CAST (Cmg.OverallPARating as VARCHAR(50)) AS OverallPARating,
	Pos.PositionName,
	Emp.ReportingToName,
	Emp.DateJoined,
	YEAR (GETDATE()) - CAST (SUBSTRING(emp.CurrentPositionDate, 4, 4) AS INT)AS IncumbentYearsInCurrentPosition ,
	YEAR (GETDATE()) - CAST (SUBSTRING(emp.DateJoined, 4, 4) AS INT) AS IncumbentYearsInService,
	Cmg.MonthlySalary,
	Cmg.Performance,
	Cmg.Collaboration,
	Cmg.Potential,
	Rep.ReplacementName,
	Rep.DegOfReadinessID,
	Rep.ReplacementCompensation,
	(SELECT TOP (1)YEAR (GETDATE()) - CAST (SUBSTRING(emp.DateJoined, 4, 4) AS INT) FROM Employees Emp WHERE Rep.ReplacementEmployeeID=Emp.EmployeeID) AS ReplacementYrsInService 
--(SELECT TOP (1) Cmg.MonthlySalary FROM ColorMeGreens Cmg WHERE Cmg.EmployeeID = Rep.ReplacementEmployeeID) AS ReplacementCompensation
	
	
FROM Employees Emp

LEFT JOIN ColorMeGreens Cmg
ON Cmg.EmployeeID = Emp.EmployeeID

LEFT JOIN Positions Pos
ON Pos.PositionID = Emp.PositionID

LEFT JOIN Replacements Rep
ON Rep.EmployeeID = emp.EmployeeID


WHERE
	Cmg.YearOfUpdate BETWEEN @YrOfUpdateFROM AND @YrOfUpdateTO
	 AND ((@FTW IS NULL) OR (Cmg.FTW = @FTW))
	 AND ((@HP IS NULL) OR (Cmg.HP = @HP))
	 AND ((@LocalSupervisor IS NULL) OR (Emp.ReportingToName = @LocalSupervisor))
	 AND ((@JobLevel IS NULL) OR (Emp.JobLevelID = @JobLevel))
	 AND ((@JobType IS NULL) OR (Emp.JobTypeID = @JobType))
	 AND ((@Positions IS NULL) OR (Emp.PositionID = @Positions))
	 AND  ((@Divisions IS NULL) OR (Emp.DivisionID = @Divisions))
	 AND ((@Gender IS NULL) OR (Emp.Gender = @Gender))
	 AND ((@EmployeeName IS NULL) OR (Emp.FirstName + ' ' + Emp.LastName = @EmployeeName))

ORDER BY Emp.EmployeeID
		
	
END



My code for the passing of the parameters:

 protected void Page_Load(object sender, EventArgs e)
        {
          
            string  LocalSupervisor, JobLevel, JobType, Positions, Divisions, Gender, FiscalYrFROM, FiscalYrTO, EmployeeName, HP, FTW;
            HP = Convert.ToString(Session["orpHP"]);
            FTW = Convert.ToString(Session["orpFTW"]);
            JobLevel = Convert.ToString(Session["orpJobLevel"]);
            JobType = Convert.ToString(Session["orpJobType"]);
            Positions = Convert.ToString(Session["orpPositions"]);
            Divisions = Convert.ToString(Session["orpDivisions"]);
            Gender = Convert.ToString(Session["orpGender"]);
            FiscalYrFROM = Convert.ToString(Session["orpYearFrom"]);
            FiscalYrTO = Convert.ToString(Session["orpYearTo"]);
            EmployeeName = Convert.ToString(Session["orpEmployeeName"]);
            LocalSupervisor = Convert.ToString(Session["orpLocalSupervisor"]);

            OrganizationalPlanningReport rpt_OSW1 = new OrganizationalPlanningReport();

         

            rpt_OSW1.SetParameterValue("@HP", HP);
            rpt_OSW1.SetParameterValue("@FTW", FTW);
            rpt_OSW1.SetParameterValue("@LocalSupervisor", LocalSupervisor);
            rpt_OSW1.SetParameterValue("@JobLevel", JobLevel);
            rpt_OSW1.SetParameterValue("@JobType", JobType);
            rpt_OSW1.SetParameterValue("@Positions", Positions);
            rpt_OSW1.SetParameterValue("@Divisions", Divisions);
            rpt_OSW1.SetParameterValue("@Gender", Gender);
            rpt_OSW1.SetParameterValue("@YrOfUpdateFROM", FiscalYrFROM);
            rpt_OSW1.SetParameterValue("@YrOfUpdateFROM", FiscalYrTO);
            rpt_OSW1.SetParameterValue("@EmployeeName", EmployeeName);

            CrystalReportViewer1.ReportSource = rpt_OSW1;
        }