SheetJS Uncaught Error: Cannot access file

I am trying to read XLSX file one cell data. but I get an error "Uncaught Error: Cannot access file"

Uncaught Error: Cannot access file Hinnapakkumine.xlsx
at V (xlsx.full.min.js:12)
at qv (xlsx.full.min.js:22)
at Object.eg (xlsx.full.min.js:22)
at HTMLButtonElement.document.getElementById.onclick (Javascript.js:28)

My final coal is to replace one cell value to the variable hind and the point of this code is to get contact form data after a button is clicked and edit excel file with that data. Why am I getting this error and how to solve it?

document.getElementById("saatmisnuppKontakt").onclick = function() {
    var laius = document.getElementById("laiusKontakt").value;
    var pikkus = document.getElementById("pikkusKontakt").value;
    var kõrgus = document.getElementById("korgusKontakt").value;
    var hind = 0;
    if (pikkus * laius >= 100){
        hind = pikkus * laius * 85;
    }else if (100 < pikkus * laius <= 200 ){
        hind = pikkus * laius * 77;
    }else if (200 < pikkus * laius <= 1000 ){
        hind = pikkus * laius * 75;
    }else if (1000 < pikkus * laius <= 2000 ){
        hind = pikkus * laius * 80;
    }else if (2000 < pikkus * laius <= 4000) {
        hind = pikkus * laius * 85;
    }
    if (3 <= kõrgus <= 6){
        hind *= 1;
    }else if(kõrgus == 7){
        hind *= 1.1;
    }else if (kõrgus == 8){
        hind *= 1.2;
    }else if (kõrgus == 9) {
        hind *= 1.3;
}

    var workbook = XLSX.readFile('Hinnapakkumine.xlsx');
    /* DO SOMETHING WITH workbook HERE */
    var first_sheet_name = workbook.SheetNames[0];
    var address_of_cell = 'G18';

    /* Get worksheet */
    var worksheet = workbook.Sheets[first_sheet_name];

    /* Find desired cell */
    var desired_cell = worksheet[address_of_cell];

    /* Get the value */
    var desired_value = (desired_cell ? desired_cell.v : undefined);
    window.alert(desired_value);

};

Unfortunately you can't use readFile in the browser:

readFile is only available in server environments. Browsers have no API for reading arbitrary files given a path, so another strategy must be used.