SSRS - 404 page not found

I have a windows 2008 server running SSRS on SQL 2008. It is also a web server with Plesk installed.

I have been developing reports for this server for some time now on a development server. Everything is working fine on the development server. But I tried to move the reports to the live server and I get the error below:

Server Error

404 - File or directory not found. The resource you are looking for might have been removed, had its name changed, or is temporarily unavailable.

I am not sure why this is happening, because when I access the reports URL on its own it works fine. But as soon as I call the report in my web application hosted on the very same server I get this error. My application is written in c# and asp.net. Here is a section of code I use to access the report. Any help would be greatly appreciated:

        string ExpId1 = Convert.ToString(Request.QueryString["Id"]).Trim();
        string ExpId2 = ExpId1.Replace("@", "+");
        Int32 ExpId3 = Convert.ToInt32(qsc.decryptQueryString(ExpId2));
        string id=ExpId3.ToString();
        ReportViewer1.Width = 1050;
        ReportViewer1.Height = 600;
        ReportViewer1.Style.Add("Overflow", "Scroll");
        ReportViewer1.ProcessingMode = ProcessingMode.Remote;
        IReportServerCredentials irsc = new CustomReportCredential开发者_如何学Cs("user", "password", "server");
        ReportViewer1.ServerReport.ReportServerCredentials = irsc;
        ReportParameter[] para = new ReportParameter[2];
        para[0] = new ReportParameter();
        para[0].Name = "ExpHearderId";
        para[0].Values.Add(id);//any value

        para[1] = new ReportParameter();
        para[1].Name = "ExpHeadreId";
        para[1].Values.Add(id);//any value


        ReportViewer1.ServerReport.ReportServerUrl = new Uri("http://xxx.xxx.xxx.xxx/reportserver_TGO");
        string path=Server.MapPath("~/ReportingofUsers/ExpenseClaimReport");
        ReportViewer1.ServerReport.ReportPath = path;
        ReportViewer1.ServerReport.SetParameters(para);
        ReportViewer1.ShowParameterPrompts = false;
        ReportViewer1.ServerReport.Refresh();
        ReportViewer1.Visible = true;

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This should help: http://otkfounder.blogspot.com/2007/11/solving-reportviewer-rendering-issue-on.html

EDIT: One more thing. I'm pretty sure that when you use Reports Server you should not use Server.MapPath. Just specify the path as you see it in Reports Server, in your case: /ReportingofUsers/ExpenseClaimReport. That is assuming that you publish reports to the server.