Import Random

I do not know why the error message for my code says that Task 1 is not working anymore.. In Task 1 I just had to import random, since Task 1 I did not change the import at all, but now that I wrote some Code for Task 3, the message says Task 1 is the problem. There might be mistakes left in the rest of my code, but this error message does not help to fix them at all and i do not really understand it too. Little side note : I also do not really get why I have to invert 0, because it is false. The second # note says that :)

Hope for quick response and I am happy about any kind of help on that task ...

import random

start = 5

while start != 0 :
    num = random.randint(1, 99)
    answer = even_odd(num)
    if answer == 0 :
        print("{} is even".format(num))
    else :
        print ("{} is odd".format(num))
    start = start - 1
def even_odd(num):
    # If % 2 is 0, the number is even.
    # Since 0 is falsey, we have to invert it with not.
    return not num % 2