i'm running the following code and getting error 'AssertionError: 15 is divisible by 3 and 5'. Don't know where i made a mistake.

def checkio(number):
if ((number%3==0) and (number%5==0)):
return "FixxBuzz"
elif (number%3)==0:
return "Fizz"
elif (number%5)==0:
return "Buzz"
else:
return str(number)

if **name** == '**main**':
assert checkio(15) == "Fizz Buzz", "15 is divisible by 3 and 5"
assert checkio(6) == "Fizz", "6 is divisible by 3"
assert checkio(5) == "Buzz", "5 is divisible by 5"
assert checkio(7) == "7", "7 is not divisible by 3 or 5"
print("Coding complete? Click 'Check' to review your tests and earn cool rewards!")

Created at: Jan. 23, 2019, 1:58 p.m.; Updated at: Jan. 23, 2019, 2:50 p.m.

The question is resolved.