Practice makes perfect: Median

I am unsure what this error message means and where my code is wrong:

"Oops, try again. median([4, 5, 5, 4]) resulted in an error: unsupported operand type(s) for /: 'tuple' and 'int'"

As with everyone else, I expected my code just to run without problems.

```
def median(numbers):
new_list = sorted(numbers)
if (len(numbers) % 2) == 0:
return (new_list[len(new_list)/2],
+ new_list[(len(new_list)/2) - 1])/2
else:
return new_list[(len(new_list)/2) - 1]
```