Compiler Error CS1906

Invalid option 'option'; Resource visibility must be either 'public' or 'private'

This error indicates an invalid use of the /resource or /linkresource command-line option. For more information, see EmbeddedResource (Embed Resource File to Output) and LinkResource (Link to .NET Framework Resource). Check the syntax of the /resource or /linkresource command-line option, and make sure that the accessibility modifier used is either public or private.