I have configured the code and it looks like the codes in the discussion that seem to run. I get a message:

Oops, try again. get_class_average([alice]) resulted in an error: 'NoneType' object is not utterable

it seems to relate to the last function but I cannot find what is wrong!

```
Replace this line with your code.
lloyd = {
"name": "Lloyd",
"homework": [90.0, 97.0, 75.0, 92.0],
"quizzes": [88.0, 40.0, 94.0],
"tests": [75.0, 90.0]
}
alice = {
"name": "Alice",
"homework": [100.0, 92.0, 98.0, 100.0],
"quizzes": [82.0, 83.0, 91.0],
"tests": [89.0, 97.0]
}
tyler = {
"name": "Tyler",
"homework": [0.0, 87.0, 75.0, 22.0],
"quizzes": [0.0, 75.0, 78.0],
"tests": [100.0, 100.0]
}
# Add your function below!
def average(numbers):
total=sum(numbers)
total=float(total)
return total/len(numbers)
students=[lloyd,alice,tyler]
def get_average(student):
homework=average(student['homework'])*0.1
quizzes=average(student['quizzes'])*0.3
tests=average(student['tests'])*0.6
wt_ave=homework+quizzes+tests
return (wt_ave)
```