Error with "Exchange get mails"

I am trying to read some messages from a email and download attached files. For This, I use “Exchange get email” activity, but Orchestrator send me back this exception message:

“Microsoft.Exchange.WebServices.Data.ServiceResponseException: When making a request as an account that does not have a mailbox, you must specify the mailbox primary SMTP address for any distinguished folder Ids. at CaixaBank.Arquitectura.Mail.ExchangeActivity`1.EndExecute(AsyncCodeActivityContext context, IAsyncResult result) at System.Activities.AsyncCodeActivity.System.Activities.IAsyncCodeActivity.FinishExecution(AsyncCodeActivityContext context, IAsyncResult result) at System.Activities.AsyncCodeActivity.CompleteAsyncCodeActivityData.CompleteAsyncCodeActivityWorkItem.Execute(ActivityExecutor executor, BookmarkManager bookmarkManager)”

Would someone tell me what’s the problem?