Error converting data type nvarchar to date

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SQL-Server-2012

Hi friends
I want to fill DataSet with Store Procedure.but when i have run my project i get this error:
Error converting data type nvarchar to date.
1- Do i have to

SqlDataAdapter adp = new SqlDataAdapter();
           adp.SelectCommand = new SqlCommand();
           adp.SelectCommand.Connection = con;
           adp.SelectCommand.CommandText = "Report";

           adp.SelectCommand.CommandType = CommandType.StoredProcedure;
           DataSet set = new DataSet();
           DataTable dtbl = new DataTable("DataTable1");


           adp.SelectCommand.Parameters.AddWithValue("@clrk_Name", txtNameReport.Text);
           adp.SelectCommand.Parameters.AddWithValue("@clrk_Family",txtFamilyReport.Text);
           adp.SelectCommand.Parameters.AddWithValue("@clrk_MelliCode",txtMelliCodeReport.Text);
           adp.SelectCommand.Parameters.AddWithValue("@AzTarikh",txtMelliCodeReport.Text);
           adp.SelectCommand.Parameters.AddWithValue("@Ela", txtElaReport.Text);
           adp.Fill(set, "DataTable1");// this line have got error
           ReportDataSource  source = new ReportDataSource ("datatable1",dtbl );
           reportViewer1.Visible = true;

           reportViewer1.LocalReport.ReportPath = "report1.rdlc";
           reportViewer1.LocalReport.DataSources.Clear();
           reportViewer1.LocalReport.DataSources.Add(source);
           reportViewer1.LocalReport.Refresh();

STORE PROCEDURE

USE [ClerksEvaluation]
GO
/****** Object:  StoredProcedure [dbo].[Report]    Script Date: 02/03/2013 09:24:42 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER procedure [dbo].[Report]

@clrk_Name	Nvarchar(50),
@clrk_Family		Nvarchar(60),
@clrk_MelliCode		Char(10),
@AzTarikh			Date,
@Ela				Date

AS

Declare @id int
select @id = clrk_Id from Clerk 
where clrk_Name = @clrk_Name and clrk_Family = @clrk_Family and clrk_MelliCode = @clrk_MelliCode

select  clrk_Name,clrk_Family,clrk_MelliCode,clrk_FatherName, epcnt_Name, clrke_Percent, clrke_Tozihat, clrke_Date, clrke_Hafteh  
from ClerkEvaluation
inner join Clerk on Clerk.clrk_Id = @id
inner join EvaluationPercent on ClerkEvaluation.epcnt_Id = EvaluationPercent.epcnt_Id
where clrke_Date Between @AzTarikh and @Ela

//i get date from this line but dataset can't fill data kind of date.I don't know where i should use convert?
how can i put a date into dataset?

[Edit]Code blocks added[/Edit]