The University of Nebraska–Lincoln, often referred to as Nebraska, UNL or NU, is a public research university in the city of Lincoln, in the state of Nebraska in the Midwestern United States. It is the state's oldest university, and the largest in the University of Nebraska system.
There are multiple universities in Nebraska
The context mentions a "University of Nebraska system" and that Nebraska is the state's oldest university which means there must be other, 'younger' universities in the state. The system didn't understand what those two statements were alluding to. 