Either the permissions on the D:\Bibliotecas\Principal\Desconocido\untitled (13618) folder are incorrect or it is open in some other program or some other program created a new file in the folder after calibre started the delete operation. calibre opens all files in the folder before starting the copy operation, to ensure that deletion will not fail. However this doesnt work for the folder itself and if any other program creates files inside the folder between the start and end of the opetration.
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