That's a limit from twitter. So you have to remove some followings, and try to add new active followings. Unless your followers numbers reach 2000 followers, you can't add followings more than 2000. And after you get 2000 followers, you can add about 10% followings for your account, such as 2000 followers, can get 22000 followers...etc
I think lapidus means 'following'. Once you get to following 2000 you have to wait until you have almost the same followers. This is to stop so called spam accounts from just following all the world. Try UN-following some of the ones who aren't following you until the two figures get closer together.