I am getting an error: " Bummer! Couldn't find `most_courses`". How is that possible ?

# 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.


def most_courses(dictionary):
    teacher_with_max_courses = ""
    max_count = 0
    for teacher in dictionary.keys():
        if max_count < len(dictionary[teacher]):
            max_count = len(dictionar[teacher])
            teacher_with_max_courses = teacher
    return teacher_with_max_courses


def num_teachers(dictionary):
    count = 0
    for teacher in dictionary.keys():
        count += 1
    return count  

def num_courses(dictionary):
    count = 0
    for list_of_courses in dictionary.values():
        for course in list_of_courses:
            count += 1
    return count

def courses(dictionary):
    list_of_all_courses = []
    for list_of_teacher_courses in dictionary.values():
        for course in list_of_teacher_courses:
            list_of_all_courses.append(course)
    return list_of_all_courses