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Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.
Compiler Error Message: CS0433: The type 'mmet.rgen' exists in both 'c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\mail\d77eac0c\a5fb2812\assembly\dl3\c6e9aa33\e7f7b4c8_463acc01\WebMail.DLL' and 'c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\mail\d77eac0c\a5fb2812\App_Code.n0dshhx5.dll'
I created an web application in Visual studio 2010 and copied that code in to my project which is running on its own compiler using a batch file. After I am running this application in IIS 7.5 I am getting this error. I reinstalled OS and tried but no use. When I delete temporary files in .NET framework folder I am getting an error as "Source not found"
498
I've had a similar message with Microsoft Report Viewer, this is caused when you have a reference in your web.config to lets say to version 10, and yet in one of your aspx pages you have a reference to verion 11.
If you have this you will get the type of error you are showing above. Make sure all you versions are the same. As you can see in the example below, at the top of the page you could be making a reference to a different verions.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="EarlyDeparture_DepartmentReport.aspx.cs" Inherits="Reports_LateArrival_LateArrival_DepartmentReport_01" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ Register Assembly="Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
Namespace="Microsoft.Reporting.WebForms" TagPrefix="rsweb" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<rsweb:ReportViewer ID="ReportViewer1" runat="server" Width="100%">
</rsweb:ReportViewer>
</div>
</form>
</body>
</html>
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