Telerik.ReportViewer.WebForms.ReportViewer exists in both Temporary ASP.NET Files & GAC_MSIL Error

[Aron]

Hello,

I have not been able to build my solution because of this error:

Error   64   The type 'Telerik.ReportViewer.WebForms.ReportViewer' exists in both 'c:\Users\me\AppData\Local\Temp\Temporary ASP.NET Files\root\21b51189\d0797591\assembly\dl3\68de48c5\40e0037f_14fbcb01\Telerik.ReportViewer.WebForms.DLL' and 'c:\Windows\assembly\GAC_MSIL\Telerik.ReportViewer.WebForms\4.1.10.921__a9d7983dfcc261be\Telerik.ReportViewer.WebForms.dll'   C:\Projects\TheaterSales\DemoSite\BoxOffice\EventManagment\PrintAttendeeTickets\eTicketsPerEventId.aspx   11   

Any ideas on what to do? thanks

Error: http://img11.imageshack.us/img11/3103/builderor1.png

Code On Page:

<%@ Page  Language="C#" MasterPageFile="~/AdminMasterPage.master" AutoEventWireup="true" CodeFile="eTicketsPerEventId.aspx.cs" Inherits="BoxOffice_EventManagment_PrintAttendeeTickets_eTicketsPerEventId" %>
<%@ Register Assembly="Telerik.ReportViewer.WebForms, Version=4.1.10.921, Culture=neutral, PublicKeyToken=a9d7983dfcc261be"
    Namespace="Telerik.ReportViewer.WebForms" TagPrefix="telerik"  %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentplaceholderRight" Runat="Server">
</asp:Content>
<asp:Content ID="Content3" ContentPlaceHolderID="conMain" Runat="Server">

    <telerik:ReportViewer runat="server" ID="report1" Width="100%" Height="700px" BorderStyle="None"

    Report="ReportTestClassLibrary1.ViewEticketsByEventId, SimpleTickReporting, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" >
    </telerik:ReportViewer>

</asp:Content>

web.config

    <compilation debug="true" batch="false">
            <assemblies>
                <add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                <add assembly="System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                <add assembly="System.Drawing.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                <add assembly="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
                <add assembly="System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                <add assembly="System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
                <add assembly="System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                <add assembly="System.Xml, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
                <add assembly="System.Web.Services, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                <add assembly="System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
                <add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
                <add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
                <add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
                <add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
                <add assembly="System.Web.Extensions.Design, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
                <add assembly="Telerik.Reporting, Version=4.1.10.921, Culture=neutral, PublicKeyToken=A9D7983DFCC261BE"/>
                <add assembly="Telerik.ReportViewer.WebForms, Version=4.1.10.921, Culture=neutral, PublicKeyToken=A9D7983DFCC261BE"/>
      </assemblies>
        </compilation>


<controls>
                <add tagPrefix="uc1" tagName="NewsArticles" src="~/MasterPages/Controls/NewsArticles.ascx"/>
                <add tagPrefix="uc1" tagName="CurrentEvents" src="~/MasterPages/Controls/CurrentEvents.ascx"/>
                <add tagPrefix="telerik" namespace="Telerik.Web.UI" assembly="Telerik.Web.UI"/>
                <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
                <add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
                <add tagPrefix="cc2" namespace="AjaxControlToolkit" assembly="AjaxControlToolkit"/>
                <add tagPrefix="cc1" namespace="TS.Common.WebUI.Controls" assembly="CommonClassLib"/>
                <add tagPrefix="ST" namespace="SimpleTick.WebControls"/>
                <add tagPrefix="telerik" namespace="Telerik.ReportViewer.WebForms" assembly="Telerik.ReportViewer.WebForms, Version=4.1.10.921, Culture=neutral, PublicKeyToken=a9d7983dfcc261be"/>
            </controls>


<httpHandlers>
            <remove verb="*" path="*.asmx"/>
            <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
            <add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
            <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validate="false"/>
            <add path="Telerik.RadUploadProgressHandler.ashx" type="Telerik.Web.UI.RadUploadProgressHandler" verb="*" validate="false"/>
            <add path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" validate="false"/>
            <add path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" verb="*" validate="false"/>
            <add path="ChartImage.axd" type="Telerik.Web.UI.ChartHttpHandler" verb="*" validate="false"/>
            <add path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" validate="false"/>
            <add path="Telerik.ReportViewer.axd" type="Telerik.ReportViewer.WebForms.HttpHandler, Telerik.ReportViewer.WebForms, Version=4.1.10.921, Culture=neutral, PublicKeyToken=a9d7983dfcc261be" verb="*" validate="true"/>
        </httpHandlers>

[IvanDT]

Hello Aron,

This is a generic error and usually means that there is a mismatch in your referenced dll and the actual one used. Most likely you have not uninstalled previous reporting installations and have mismatched references. Please use the Upgrade Wizard to upgrade your projects containing Telerik reports and rebuild the project. If you have added manual references i.e. Copy Local = True, then delete all assemblies from bin folder, re-add proper references in the project and rebuild the project after that.

Best wishes,
IvanDT
the Telerik team

[Brent Kauth]

I did what you recommended but it didn't help. I still get the same error. Do you have any other solutions for this problem?  

[Neli]

Hello Brent,

Here are the steps that you can also try:

- make sure that the assembly references to Telerik Reporting in your web.config are pointing to the same version as the one installed on your machine;

or:

1. Remove all references to Telerik DLL files.

2. Add them back from the GAC list (not from physical location) - under Assemblies in the Reference Manager.

3. Set Copy Local on new DLL files to True.

Regards,
Neli
Progress Telerik