Fix Key error :Key cannot be the null string

When you get this error message, that mean Barnes & Noble  account info you input isn’t correct,  this is tutorial how to find correct info for a book.

  • Your Name: This is the name used by Barnes and Noble to generate your encryption key.
    Seemingly at random, Barnes and Noble choose one of three places from which to take this name.

    Most commonly, it’s your name as set in your Barnes & Noble account, My Account page, directly under PERSONAL INFORMATION.

    Sometimes it is the the name used in the default shipping address.

    sometimes it’s the name listed for the active credit card.

    If these names are different in your Barnes and Noble account preferences, suggest try them one by one.

  • Credit Card#: this is the default credit card number that was on file with Barnes and Noble at the time of download of the ebook to be de-DRMed. Just enter the 16 (15 for American Express) digits.
  • Credit Card Number don’t need any more after NOOK Key created.

**if you don’t find billing address in order, that mean it is default address.

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