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Reference required to assembly '<assemblyname>' containing the implemented interface '<interfacename>'

Reference required to assembly '<assemblyname>' containing the implemented interface '<interfacename>'. Add one to your project.

The interface is defined in a dynamic-link library (DLL) or assembly that is not directly referenced in your project. The Visual Basic compiler requires a reference to avoid ambiguity in case the interface is defined in more than one DLL or assembly.

Error ID: BC30009

To correct this error

  • Include the name of the unreferenced DLL or assembly in your project references.

See also