There is a JavaScript error on Browser console

Hello,

I'm getting a browser console JavaScript error on my Record Producer from the portal side.

Here is my code:

function onChange(control, oldValue, newValue, isLoading) {

    if (isLoading) {

        return;

    }

    var index = "1";

    var spendPlan = "spend_plan_" + index;

    var amount = "original_amount_" + index;

    var adjAmount = "adjusted_amount_" + index;

    var total = 0.0;

    g_form.setDisplay('total_adjusted_amount', false);

    g_form.setValue('total_adjusted_amount', '');

    //clear and hide all fields

    for (var i = 1; i < 11; i++) {

        index = (i).toString();

        spendPlan = "spend_plan_" + index;

        amount = "original_amount_" + index;

        adjAmount = "adjusted_amount_" + index;

        g_form.setDisplay(spendPlan, false);

        g_form.setValue(spendPlan, '');

        g_form.setDisplay(amount, false);

        g_form.setValue(amount, '');

        g_form.setDisplay(adjAmount, false);

        g_form.setValue(adjAmount, '');

    }

    if (!isLoading && newValue != oldValue) {

        var ga = new GlideAjax('x_g_duas_abm.DCSA_ABMUtils');

        ga.addParam('sysparm_name', 'getRequestDetails');

        ga.addParam('sysparm_req_id', g_form.getValue('funding_request'));

        ga.getXML(gaCallBack);

    }

    function gaCallBack(response) {

        //Grabs answer from GlideAjax call

        var answer = response.responseXML.documentElement.getAttribute("answer");

        answer = JSON.parse(answer);

        for (var i = 0; i < answer.spendPlan.length; i++) {

            index = (i+1).toString();

            spendPlan = "spend_plan_" + index;

            amount = "original_amount_" + index;

            adjAmount = "adjusted_amount_" + index;

            total += parseFloat(answer.amount[i]);

            g_form.setDisplay(spendPlan, true);

            g_form.setValue(spendPlan, answer.spendPlan[i]);

            g_form.setDisplay(amount, true);

            g_form.setValue(amount, formatNumber(parseFloat(answer.amount[i])));

            g_form.setDisplay(adjAmount, true);

            g_form.setValue(adjAmount, formatNumber(parseFloat(answer.amount[i])));

        }

        g_form.setDisplay('total_adjusted_amount', true);

        g_form.setValue('total_adjusted_amount', formatNumber(total));

    }

}

function formatNumber(num) {

    return '$' + num.toFixed(2).replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1,');

}

Can anyone direct me as to what I have done wrong?