Unable to report viewer

I am unable to see report viewer control in UI post button click and also in aspx I am getting the below error message in design view.

Error Creating Control - ReportViewer1Failed to create designer 'Microsoft.Reporting.WebForms.ReportViewer, Microsoft.ReportViewer.WebForms,

Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'

ASPX:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ExportReportToPDF.aspx.cs"

Inherits="ExportReportss.ExportReportToPDF" EnableEventValidation="false" %>

<%@ Register Assembly="Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral,

PublicKeyToken=b03f5f7f11d50a3a"

Namespace="Microsoft.Reporting.WebForms" TagPrefix="rsweb" %>

"http://www.w3.org/1999/xhtml">

"server">

Code Behind:

public partial class ExportReportToPDF : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

protected void btnGetReport_Click(object sender, EventArgs e)

{

try

{

ReportViewer1.ProcessingMode = ProcessingMode.Remote;

ReportViewer1.ServerReport.ReportServerUrl = new Uri("http://Modile/Reports");

ReportViewer1.ServerReport.Refresh();

}

catch (Exception ex)

{

}

}

}

In web.config file I have added the below lines under system.webServer tag

"ReportViewerWebControlHandler" preCondition="integratedMode" verb="*" path="Reserved.ReportViewerWebControl.axd" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />

I don't have access to the URL (http://Modile/Reports) I am using here and not sure if that is the issue. Can anyone help me this one?