Not sure if I can take any classes next semester

Just when I got what I thought I had gotten all my loans out of default, a small one from the college I went to in Nebraska has popped up. Damn it. I thought they were all going to get out of default. If so, someone messed up. Otherwise, I have to figure out if they will accept a payment plan. Otherwise, I'm screwed and won't be able to get any financial aid.