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.NET Framework error in Português (Portuguese):

Quando utilizar o estilo rpc-encoded, os tipos de contrato de mensagem ou o tipo System.ServiceModel.Channels.Message não podem ser utilizados se a operação não tiver parâmetros ou se tiver um valor de retorno vazio. Adicione um tipo de contrato de mensagem em branco como parâmetro ou tipo de retorno para a operação '{0}'.

English translation: When using the rpc-encoded style, message contract types or the System.ServiceModel.Channels.Message type cannot be used if the operation has no parameters or has a void return value. Add a blank message contract type as a parameter or return type to operation '{0}'.

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