When trying to run a Data feed/ Data Import, you'll receive An Unexpected error has occurred: The device is not ready. Image description
This could be due to missing or incorrect access to the File Repository shared path/folder.
Try accessing the File repository from the server (while logged in using the service account). If not accessible, then give the Service Account the required access as per KB 000031903 - What are the minimum privileges the service account must have in Archer?