Problem in Declare a Read-Only Variable with the const Keyword

Tell us what’s happening:
while doing this “ES6: Declare a Read-Only Variable with the const Keyword” lesson i am getting this error message “Unexpected token ?”.

is there any way to skip this exercise and continue to next one ?

Your code so far

function printManyTimes(str) {
  "use strict";

  // change code below this line

   const SENTENCE = str + "is cool!";
   for(let i = 0; i < str.length; i+=2) {

  // change code above this line


Your browser information:

User Agent is: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.87 Safari/537.36.

Link to the challenge:

You’re not the only one. It looks like a bug. I replicated it on Google Chrome. Just report it as a bug on the Github so the maintainers can work on it