[Solved] Javascript :Uncaught TypeError: Cannot read property ‘innerHTML’ of undefined at HTMLButtonElement [closed]

techno_ learner Asks: Javascript :Uncaught TypeError: Cannot read property ‘innerHTML’ of undefined at HTMLButtonElement [closed]
I cannot solve this error , it tells me that my buttons are undefined and cannot read their innerHtml attribute, the convert method is defined in the original code file and i have no problem with it,can you help me , the error comes from the code section below:

Code:
var btnsArr = document.getElementsByClassName("btn")

for (var i = 0; i < btnsArr.length; i++) {
    btnsArr[i].addEventListener("click", function () {
        Convert(btnsArr[i].innerHTML);
        return false;
    })
}

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