Для решения этой проблемы удалите из файла конфигурации Web.config следующий параметр конфигурации: <appsettings><add key="aspnet:UseTaskFriendlySynchronizationContext"></add></appsettings>

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To work around this, remove the following configuration switch in Web.config: <appsettings><add key="aspnet:UseTaskFriendlySynchronizationContext"></add></appsettings>

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