Load Report Failed Error Appears

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C#

protected void Button5_Click(object sender, EventArgs e)
{
con = new SqlConnection("Server=(local);initial catalog=master;Trusted_Connection=True");
con.Open();
string str = "select * from Empdet where EmployeeID='" + DropDownList1.SelectedValue + "'";
SqlCommand com = new SqlCommand(str, con);
SqlDataAdapter sqlda = new SqlDataAdapter(com);
DataSet ds = new DataSet();
sqlda.Fill(ds, "Empdet");
con.Close();

ReportDocument r1 = new ReportDocument();
string path = Server.MapPath("Reports/Employee.rpt");
r1.Load(path);
r1.SetDataSource(ds);
CrystalReportViewer1.ReportSource = r1;
CrystalReportViewer1.RefreshReport();

Textbox Button.

In textbox when i type partiuclar employee id and click the button,Error As follows
Load Report failed.please help me and send the code.