I need to use Espionage with an external drive. I created a folder named "EspionageImages" in that external drive. I dragged and dropped the desired encrypted folder from the external drive to the Espionage list and when the program asks I choose the path of Image Location BUT the results is a warning saying: "Error creating disk image. Failed to mount disk image, error:" (See the attached file). I need your help in order to use an external drive to encrypt a folder.