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.NET Framework error in Português (Portuguese):

Quando unwrapSingleProperty é especificada, a expressão de argumento deve ter o seguinte ResultType: um CollectionType com um tipo de elemento estruturado que declara exatamente uma propriedade.

English translation: When unwrapSingleProperty is specified the argument expression must have the following ResultType: a CollectionType with a structured element type that declares exactly one property.

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