Why am I getting the syntax error: parse error?

Although I figured out a solution, I would still like to know what is going on here. The code I originally wrote is accepted by every other console I have tried it on.

Original:

let numbers; for (let i = 4; i <= 156; i++) { numbers = i; console.log(numbers); }

As you can see, I am conditioned to using 'const' and 'let' in place of the outdated 'var'. I also replaced 'i += 1' with 'i++'. Again, these are the exact same thing. I would even argue that mine is better because it takes up 1 less character. I have had no problems using this syntax in treehouse workspace. It's only when I am taking a quiz that it gives me problems. Am I missing something here???

Below are the changes I had to make to pass the quiz.

Changes:

var numbers; for (var i = 4; i <= 156; i += 1) { numbers = i; console.log(numbers); }