When I try to sign in to the OverDrive catalog, I receive the error (2) Invalid Library Card. What does this mean?

This means that you have entered an incorrect library card number. When signing in, be sure to enter all 8 digits of your library card number (if your card number has less than 8 digits, add enough zeros to the front of your number until it is 8 digits long) or if your card number starts with ecard, enter that word along with the 7 trailing digits.