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Assembly loading errors

Hello. I'm having a problem with SAP CrystalReports during runtime.

First, the assembly file isn't found, even though CrystalReports is installed and all assemblies are registered:

System.Configuration.ConfigurationErrorsException: Could not load file or assembly 'CrystalDecisions.Web, Version=13.0.2000.0, Culture=neutral' or one of its dependencies. The system cannot find the file specified. (C:\Program Files\FMS\GeoPortal2\reporting\web.config line 34) ---> System.IO.FileNotFoundException: Could not load file or assembly 'CrystalDecisions.Web, Version=13.0.2000.0, Culture=neutral' or one of its dependencies. The system cannot find the file specified.

I then tried to set the CrystalDecisions.Web assembly in the project to "Copy Local"=true, so that it would be included in the deployed project. That got me a different error:

System.Web.HttpCompileException (0x80004005): c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\geo2\e2a70b87\2b9be05\App_Web_reportviewer.aspx.733fdbe7.njrhyncf.0.cs(254): error CS0433: The type 'CrystalDecisions.Web.CrystalReportViewer' exists in both 'c:\Windows\assembly\GAC_MSIL\CrystalDecisions.Web\13.0.2000.0__692fbea5521e1304\CrystalDecisions.Web.dll' and 'c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\geo2\e2a70b87\2b9be05\assembly\dl3\4e808648\047538f8_8e06d101\CrystalDecisions.Web.DLL'

It looks like IIS can't find the CrystalDecisions.Web assembly in the GAC, but when the assembly is included in the project, it finds both and sees a conflict.

What could be the problem and how can I solve it?

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