F1 visa rejected for Spring 2017. University says that they are pursuing it with SEVIS ?

I had applied for Spring 2017 and also attended an interview. My visa got rejected. I informed the same to the University and moved my apllication to the Summer 2017 intake. Was awaiting my new i-20. But now I have been informed by the University that my file is with the SEVIS. I dont understand what that means. Can anyone please shed some light on this ? Or if anyone has come across the same issue ?