eBook import issue

I’m having issues importing ebooks into the application. After downloading a book the ADE app opens but no book appears. I get the message ‘Fulfilling’ followed by ‘Connection Error Detected- Digital Editions could not connect to the fulfillment server,’ despite no web connection issues. The download folder shows a ACSM like 978149262343.acsm but it just can’t complete the connection to the app. I have deleted the app and reinstalled it a few times but nothing changes. Any help would be appreciated.