I do not know where is the error


#1



Student Becomes the Teacher 9


Oops, try again. One of the following is missing or broken when we tried to use it: alice, lloyd, tyler, students, get_class_average, get_letter_grade


Replace this line with your code. 
https://image.prntscr.com/image/nWGx_7m_SEGXTgQjkbkJXA.png


#2

the list should be named students, not student


#3

Oh my god....! It is working now.Thank you


#4