No Errata
Q: When I play Quick Advance, do I have to be able to choose two friendly fighters other than my leader, and do I have to push them if I play the card?
A: You do not have to be able to choose two friendly fighters other than your leader to play the card – you can play this card even if the only friendly fighter on the battlefield is your leader. When you play the card, you can choose to push the chosen fighters 0 hexes.