Empty rows when creating pdf using jsPDF and jsPDF autotable

I am creating a pdf file using jsPDF and jsPDF autotable but the created pdf file is empty. There are no errors, I have checked the rows if empty but they are not.
I do not know why its empty when it is 43-pages long the pdf file generated

here is my code:

$scope.export = function(){

        var columns = ["Name", "Cellphone", "Work Phone"];
        var rows = [];
        for (var i = 0; i < $scope.data.length; i++) {
            rows.push({ employeename:$scope.data[i].employeename, cell_phone:$scope.data[i].cell_phone, work_phone:$scope.data[i].work_phone});

        var doc = new jsPDF('p', 'pt');
        doc.autoTable(columns, rows);

Source: AngularJS

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