Invalid Skarner

Is anyone else having trouble getting Skarner into team builder? Skarner keeps disappearing from my roster and i have to continually exit the client and log back in just to get him to reappear. Additionally, when I choose Skarner to jungle it keeps telling me that "INVALID_CHAMPION" . i get one game out of skarner tonight and then every other time I go to play him it is either invalid or he is missing