Unable to Download Error getting License. License Server Communication Problem: E_ADEPT_INTERNAL

[davidm10847869]

"Unable to Download. Error getting License. License Server Communication Problem: E_ADEPT_INTERNAL", is the error message I get when I attempt to download an ebook.  Is there a fix or some trouble shooting information that will allow me to resolve this problem.  I have a MacBook Pro with operating system OS X El Capitan Version 10.11.4. 

[Nanaky]

	quit Adobe Digital Editions.
	Navigate to /Users//Library/Application Support/Adobe/Digital Editions and drag the activation.dat file to the trash.
	If you are using 10.7, see https://helpx.adobe.com/x-productkb/global/access-hidden-user-library-files.html
	Open Adobe Digital Editions and reauthoriz