Message in Spanish (Español)
El contrato de devolución de llamada del contrato <var>Contract Name</var> no existe o no define ninguna operación. Si no se trata de un contrato dúplex, considere la posibilidad de usar ChannelFactory en lugar de DuplexChannelFactory.
Unlocalized message
The callback contract of contract <var>Contract Name</var> either does not exist or does not define any operations. If this is not a duplex contract, consider using ChannelFactory instead of DuplexChannelFactory.
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