Why does it say "couldn't find courses"?

# The dictionary will look something like:
# {'Andrew Chalkley': ['jQuery Basics', 'Node.js Basics'],
#  'Kenneth Love': ['Python Basics', 'Python Collections']}
#
# Each key will be a Teacher and the value will be a list of courses.
#
# Your code goes below here.
dict = {"Andrew Chalkey": ["jQuery Basics", "Node.js Basics"], "Kenneth Love": ["Python Basics", "Python Collections"]}

def num_teachers(dict):
    return len(dict)

def num_courses(dict):
    sum = 0
    for value in dict.values():
        sum += len(value)
    return sum

def courses(dict):
    course_list = []
    for value in dict.values():
        for value in values:
            course_list.append(value)
    return course_list