Why do I get this syntax error?

def middle_element(lst):
  if len(lst) % 2 ==0:
       new_lst=((lst[(lst /2) -1]) + lst[lst/2])
  return new_lst/2
  return lst[(len(lst)+1)/2]

Why do I keep getting a syntax error on line 5?

the lines with return have the wrong indentation

also, I think the lst you are using as part of the index should actually be len(lst) (on the 3rd line)