SAP Knowledge Base Article - Public

1768721 - Error: "UFL 'u2lcom.dll.dll' that implements this function is missing"


Web application throws below error while printing a Crystal report containing Barcode on production machine.

Error: "UFL 'u2lcom.dll.dll' that implements this function is missing."


  • Visual Studio 2008
  • Crystal Report for Visual Studio 2008 (Version 10.5)


  • There are known issues when using the CR .NET SDK in IIS 7 integrated pipeline mode.
  • These issues are currently under investigation.


  1. Go to the IIS console on server, right click on the application pool in which the application is deployed, go to 'Basic Properties'.
  2. Select click the dropdown 'Managed Pipeline Mode' and select Classic, click OK.
  3. Go to the Advanced settings of the same Application Pool
  4. Enable 64 bit application.
  5. Run the application.


'u2lcom.dll.dll', missing, Barcode, dot net , KBA , BI-DEV-NET , BI Software Development Kits (SDKs) - .NET or Other , Problem


SAP Crystal Reports, version for Visual Studio .NET 2008