SAP Knowledge Base Article - Public

1631763 - Compiler Error Message: CS0433 when compiling a VS2010 application


  • Trying to compile a VS2010 web application that uses the Crystal Reports SDK for .NET
  • Complete error description:

Compiler Error Message: CS0433: The type 'CrystalDecisions.Web.CrystalReportViewer' exists in both 'c:\WINDOWS\assembly\GAC_MSIL\CrystalDecisions.Web\12.0.2000.0__692fbea5521e1304\CrystalDecisions.Web.dll' and 'c:\WINDOWS\assembly\GAC_MSIL\CrystalDecisions.Web\13.0.2000.0__692fbea5521e1304\CrystalDecisions.Web.dll'


  • VS2010
  • Crystal Reports for Visual Studio 2010


  • Both version 13.0.2000.0 and version 12.0.2000.0 Crystal Reports assemblies are referenced in the project


  • Ensure that only version 13.0.2000.0 Crystal Reports assemblies are referenced
  • Ensure that the web.config file only contains entries for version 13.0.2000.0 of the Crystal Reports assemblies


CR2010 2010 CR4VS2010 CR4VS VS2010 NET2010 Crystal Reports for .NET Framework 4.0 crforvs 13 , KBA , BI-DEV-NET-SDK , .NET SDK / COM SDK , How To


SAP Crystal Reports, developer version for Microsoft Visual Studio