Cannot open on Nook, "This Nook cannot read this file. It may be an unsupported format"  what can I do?

I used ADE 4.0 and ebook transferred to computer and Nook - it opens on my computer but will not open in Nook.  Error message says "This Nook cannot read this file.  It may be an unsupported format."  What can I do to open it on my Nook?

First, I would recommend repairing the hard drive with Disk Utility.
If that doesn't fix the problem, there's a very dangerous command you can execute in the Terminal.  This is very hazardous, because a simple typo can result in very drastic consequences.  I have seen people erase their entire hard drive by putting a space in the wrong place!  So, please follow the directions I'm going to give you very carefully!
Open the Terminal, which is found in the Utilities folder in the Applications folder.  In the Terminal, enter the following:
sudo rm -f
Make sure to put a space after the "-f"!  Then, drag the troublesome file from the Finder and drop it on the Terminal window.  That should insert the path to the file in the command.  Then go back to the Terminal and press return.  You will be asked for your password, and when you type it, nothing will be shown as a security measure.  Press return again after entering your password.  The file should be deleted.

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