BC30560: CrystalReportViewer is ambiguous in the namespace

I am receiving the following error when I move my web project to the production server.
BC30560: 'CrystalReportViewer' is ambiguous in the namespace 'CrystalDecisions.Web'.
The web project works great on the development box.  The error message is listed below along with the detailed compiler output.
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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: BC30560: 'CrystalReportViewer' is ambiguous in the namespace 'CrystalDecisions.Web'.

Source Error:
Line 26:         <tr>
Line 27:             <td align="left">
Line 28:         <cr:crystalreportviewer id="CrystalReportViewer1" runat="server" autodatabind="true"
Line 29:             displaygrouptree="False" enabledatabaselogonprompt="False" enableparameterprompt="False"></cr:crystalreportviewer>
Line 30:         </td>
 
Show Detailed Compiler Output:
C:\WINNT\system32> "C:\WINNT\Microsoft.NET\Framework\v2.0.50727\vbc.exe" /t:library /utf8output /R:"C:\WINNT\assembly\GAC_MSIL\CrystalDecisions.CrystalReports.Engine\10.2.3600.0__692fbea5521e1304\CrystalDecisions.CrystalReports.Engine.dll" /R:"C:\WINNT\assembly\GAC_32\System.Web\2.0.0.0__b03f5f7f11d50a3a\System.Web.dll" /R:"C:\WINNT\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\histopathology\ba449dd0\9a3f7acf\assembly\dl3\dd66f409\ae084208_4cd4c701\AjaxControlToolkit.DLL" /R:"C:\WINNT\assembly\GAC_MSIL\System.Drawing\2.0.0.0__b03f5f7f11d50a3a\System.Drawing.dll" /R:"C:\WINNT\assembly\GAC\CrystalDecisions.Shared\9.1.5000.0__692fbea5521e1304\CrystalDecisions.Shared.dll" /R:"C:\WINNT\assembly\GAC\CrystalDecisions.CrystalReports.Engine\9.1.5000.0__692fbea5521e1304\CrystalDecisions.CrystalReports.Engine.dll" /R:"C:\WINNT\assembly\GAC\CrystalDecisions.Enterprise.InfoStore\10.2.3600.0__692fbea5521e1304\CrystalDecisions.Enterprise.InfoStore.dll" /R:"C:\WINNT\assembly\GAC_MSIL\System.Web.Services\2.0.0.0__b03f5f7f11d50a3a\System.Web.Services.dll" /R:"C:\WINNT\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\histopathology\ba449dd0\9a3f7acf\assembly\dl3\c3bbad45\7cac9547_c9edc801\Histopathology_VS2005.DLL" /R:"C:\WINNT\assembly\GAC\CrystalDecisions.ReportSource\9.1.5000.0__692fbea5521e1304\CrystalDecisions.ReportSource.dll" /R:"C:\WINNT\assembly\GAC_MSIL\System.Web.Extensions\1.0.61025.0__31bf3856ad364e35\System.Web.Extensions.dll" /R:"C:\WINNT\assembly\GAC_MSIL\CrystalDecisions.Shared\10.2.3600.0__692fbea5521e1304\CrystalDecisions.Shared.dll" /R:"C:\WINNT\assembly\GAC_32\System.EnterpriseServices\2.0.0.0__b03f5f7f11d50a3a\System.EnterpriseServices.dll" /R:"C:\WINNT\assembly\GAC_MSIL\System.Windows.Forms\2.0.0.0__b77a5c561934e089\System.Windows.Forms.dll" /R:"C:\WINNT\assembly\GAC_32\System.Data\2.0.0.0__b77a5c561934e089\System.Data.dll" /R:"C:\WINNT\assembly\GAC_MSIL\System.Web.Extensions.Design\1.0.61025.0__31bf3856ad364e35\System.Web.Extensions.Design.dll" /R:"C:\WINNT\assembly\GAC\CrystalDecisions.Enterprise.Framework\10.2.3600.0__692fbea5521e1304\CrystalDecisions.Enterprise.Framework.dll" /R:"C:\WINNT\assembly\GAC\CrystalDecisions.Web\9.1.5000.0__692fbea5521e1304\CrystalDecisions.Web.dll" /R:"C:\WINNT\assembly\GAC_MSIL\System\2.0.0.0__b77a5c561934e089\System.dll" /R:"C:\WINNT\assembly\GAC_MSIL\CrystalDecisions.Web\10.2.3600.0__692fbea5521e1304\CrystalDecisions.Web.dll" /R:"C:\WINNT\assembly\GAC_MSIL\System.Xml\2.0.0.0__b77a5c561934e089\System.Xml.dll" /R:"C:\WINNT\assembly\GAC_MSIL\System.Design\2.0.0.0__b03f5f7f11d50a3a\System.Design.dll" /R:"C:\WINNT\assembly\GAC_MSIL\System.Configuration\2.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll" /R:"C:\WINNT\assembly\GAC_MSIL\System.Web.Mobile\2.0.0.0__b03f5f7f11d50a3a\System.Web.Mobile.dll" /R:"C:\WINNT\assembly\GAC_MSIL\CrystalDecisions.ReportSource\10.2.3600.0__692fbea5521e1304\CrystalDecisions.ReportSource.dll" /R:"C:\WINNT\assembly\GAC_MSIL\CrystalDecisions.ReportAppServer.ClientDoc\10.2.3600.0__692fbea5521e1304\CrystalDecisions.ReportAppServer.ClientDoc.dll" /out:"C:\WINNT\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\histopathology\ba449dd0\9a3f7acf\App_Web_6ogmvtu8.dll" /debug- /win32resource:"C:\WINNT\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\histopathology\ba449dd0\9a3f7acf\6ogmvtu8.res" /define:_MYTYPE=\"Web\" /imports:Microsoft.VisualBasic,System,System.Collections,System.Collections.Specialized,System.Configuration,System.Text,System.Text.RegularExpressions,System.Web,System.Web.Caching,System.Web.SessionState,System.Web.Security,System.Web.Profile,System.Web.UI,System.Web.UI.WebControls,System.Web.UI.WebControls.WebParts,System.Web.UI.HtmlControls  "C:\WINNT\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\histopathology\ba449dd0\9a3f7acf\App_Web_6ogmvtu8.0.vb" "C:\WINNT\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\histopathology\ba449dd0\9a3f7acf\App_Web_6ogmvtu8.1.vb" "C:\WINNT\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\histopathology\ba449dd0\9a3f7acf\App_Web_6ogmvtu8.2.vb"


Microsoft (R) Visual Basic Compiler version 8.0.50727.42
for Microsoft (R) .NET Framework version 2.0.50727.42
Copyright (c) Microsoft Corporation.  All rights reserved.

C:\Inetpub\wwwroot\Intranet_New\Histopathology\HistoReport.aspx(28) : error BC30560: 'CrystalReportViewer' is ambiguous in the namespace 'CrystalDecisions.Web'.

            __ctrl = New Global.CrystalDecisions.Web.CrystalReportViewer
                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\Inetpub\wwwroot\Intranet_New\Histopathology\HistoReport.aspx(33) : error BC30560: 'CrystalReportViewer' is ambiguous in the namespace 'CrystalDecisions.Web'.

            __ctrl = New Global.CrystalDecisions.Web.CrystalReportViewer
                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\WINNT\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\histopathology\ba449dd0\9a3f7acf\App_Web_6ogmvtu8.0.vb(262) : error BC30560: 'CrystalReportViewer' is ambiguous in the namespace 'CrystalDecisions.Web'.

        Private Function __BuildControlCrystalReportViewer1() As Global.CrystalDecisions.Web.CrystalReportViewer
                                                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\WINNT\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\histopathology\ba449dd0\9a3f7acf\App_Web_6ogmvtu8.0.vb(263) : error BC30560: 'CrystalReportViewer' is ambiguous in the namespace 'CrystalDecisions.Web'.

            Dim __ctrl As Global.CrystalDecisions.Web.CrystalReportViewer
                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\WINNT\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\histopathology\ba449dd0\9a3f7acf\App_Web_6ogmvtu8.0.vb(299) : error BC30560: 'CrystalReportViewer' is ambiguous in the namespace 'CrystalDecisions.Web'.

        Private Function __BuildControlCrystalReportViewer2() As Global.CrystalDecisions.Web.CrystalReportViewer
                                                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\WINNT\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\histopathology\ba449dd0\9a3f7acf\App_Web_6ogmvtu8.0.vb(300) : error BC30560: 'CrystalReportViewer' is ambiguous in the namespace 'CrystalDecisions.Web'.

            Dim __ctrl As Global.CrystalDecisions.Web.CrystalReportViewer
                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\WINNT\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\histopathology\ba449dd0\9a3f7acf\App_Web_6ogmvtu8.0.vb(374) : error BC30560: 'CrystalReportViewer' is ambiguous in the namespace 'CrystalDecisions.Web'.

            Dim __ctrl3 As Global.CrystalDecisions.Web.CrystalReportViewer
                           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\WINNT\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\histopathology\ba449dd0\9a3f7acf\App_Web_6ogmvtu8.0.vb(390) : error BC30560: 'CrystalReportViewer' is ambiguous in the namespace 'CrystalDecisions.Web'.

            Dim __ctrl4 As Global.CrystalDecisions.Web.CrystalReportViewer
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