Недопустимый атрибут OperationContractAttribute, объявленный в методе "<var>X</var>" типа "<var>Method name</var>". Атрибуты OperationContractAttribute допустимы только в методах, которые объявлены в типах, имеющих атрибут ServiceContractAttribute. Добавьте атрибут ServiceContractAttribute к типу "<var>Method name</var>" или удалите атрибут OperationContractAttribute из метода "<var>X</var>".

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The <var>X</var> declared on method '<var>Method name</var>' in type '<var>Type Name</var>' is invalid. <var>X</var>s are only valid on methods that are declared in a type that has ServiceContractAttribute. Either add ServiceContractAttribute to type '<var>Type Name</var>' or remove <var>X</var> from method '<var>Method name</var>'.

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