DateRangePicker

I am using the daterangepicker 1.6.9
and always get
 moment.localeData(…).firstDayOfWeek is not a function
can you help me??

echo DateRangePicker::widget([
        'name' => 'daterange',
        'id' => 'daterange',
        'value' => $datefrom . ' - ' . $datetill,
        'convertFormat' => true,
        'useWithAddon' => true,
        'pluginOptions' => [
            'timePicker24Hour' => true,
            'timePicker' => true,
            'timePickerIncrement' => 15,
            'locale' => ['format' => 'd.m.Y H:i:s'],
            'opens' => 'right'
        ],
        'pluginEvents' => [
            'apply.daterangepicker' => "function(ev,picker){
            $.ajax({
            beforeSend: function () {
                $('#tablelog').empty();
                $('#tablelog').html('<p class=\"loading\"><img src=\"/y/images/loading.gif\" /></p>');
            },
             method: 'POST',
            url: '/y/salto/saltoereignislog/index',
            data: {
                datetill:moment(picker.endDate).format('YYYY-MM-DD HH:mm:ss'),
                datefrom:moment(picker.startDate).format('YYYY-MM-DD HH:mm:ss')
            },
            success: function (data) {
                $('#tablelog').html(data);
                $('.defaultDataTable').defaultDataTable();
            }
        });
        }"
        ]
    ]) . $addon;

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