Well shit it took me a minute.
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There are two mistakes in the the current message you are reading.
True. Invoking a paradox is a mistake.
The lack of a second mistake is the the second mistake. I don't know if that is a paradox though.
It's a paradox because if you count it as a mistake, then there are two mistakes, so it's not a mistake, so there's only one mistake, so it is a mistake.