Is (Double Denomination) the king of paper money error ?

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I heard that (Double Denomination) was the king of errors ?
Its value is over 1 million USD.
Is it true ?
Can anyone  reply me?

Total welcome to the forums,
              Double denomination notes are listed on page 378 of the catalogue at $2,000.

If you are bringing up your $10 note with $20 security features again, this is not a double denomination note. Also there have been many opinions on this note and it's value. My opinion is $700 if there are few and as low as $200 if there are many.

 This is my first response on this $10 note because I think it has been talked about enough and I won't comment any farther.

 Hope this helps, Gary_T

Thanks for your reply.
I mean this one:
http://www.usarare.com/index22.htm

Well, if you have a note such as the ones they are describing, perhaps a valid estimate of its value might be between USD$33,000 and USD$45,000.

Certainly not worth a million dollars. I would suggest some more thorough research on the subject by consulting one of the several specialized catalogues dedicated to United States paper money errors.

Thanks total for such a great link to US Error notes for sale . It's to bad there isn't such a store for Canadian Error notes .