Тип результата запроса не относится ни к типу EntityType, ни к CollectionType с типом элемента сущности. Путь Include можно указывать только для запроса, имеющего один из этих типов результата.

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The result type of the query is neither an EntityType nor a CollectionType with an entity element type. An Include path can only be specified for a query with one of these result types.

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