A configuração de tipos conhecidos (no grupo de seção system.runtime.serialization, seção dataContractSerializer) contém um elemento 'parameter' que tem ambos os valores 'index' e 'type' definidos. Você só pode definir um desses valores.

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Configuration for known types (in the system.runtime.serialization section group, dataContractSerializer section) contains a 'parameter' element that has both 'index' and 'type' set. You can only set one of these values.

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