Действие с параметром DisplayName="<var>X</var>" содержит аргумент с именем "<var>Y</var>", у которого тип null или void. - unlocalize.com

Message in Russian (Русский)

Действие с параметром DisplayName="<var>X</var>" содержит аргумент с именем "<var>Y</var>", у которого тип null или void.

Unlocalized message

Activity with DisplayName='<var>X</var>' has an argument named '<var>Y</var>' that is of null or void type.

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