function not working when i click button?

when i click my button, a timer is supposed to display a countdown timer. But the button does not work.

let timerCounter = document.getElementById("timer-counter");
let timer;
let timerCount;



function startTimer (){
timer = setInterval(function(){
    timerCount--;
    timerElement.textContent = "Time; " + timerCount;
    if (timerCount === 0){
        clearInterval(timer);
    }
});

}
startButton.addEventListener(“click”, startTimer);