Why this function is Not Working in Flow designer Action ?

[Patilgajanans]

Why this function is Not Working in Flow designer Action when i try from background script its working fine but when use in script action and try to call that function in flow designer it was not working

function(sys_id_data_source) {
        var gr = new GlideRecord('sys_data_source');
        gr.addQuery('sys_id', sys_id_data_source);
        gr.query();

        if (gr.next()) {

            // refresh data stream schema
            if (gr.type == 'data_stream') {
                var dsUtil = new sn_impex.GlideDataSourceUtility();
                dsUtil.refreshDataStreamSchema(gr.sys_id);
            }

            var redirectStr = "sys_import.do?"; // the URI

            redirectStr += "import_source=data_source"; // this is a Data Source import

            redirectStr += "&sysparm_data_source=" + gr.sys_id; // the sys_id of this

            redirectStr += "&sysparm_tablename=" + gr.import_set_table_name; // always create the same test

            redirectStr += "&sysparm_recreate_table=false"; // we dont want to overwrite existing

            redirectStr += "&sysparm_tablelabel=" + gr.name;

            redirectStr += "&create_new_module=ON";

            redirectStr += "&sysparm_extends=sys_import_set_row"; // always extends this

            redirectStr += "&selected_application=import_sets";

           
            gs.setRedirect(redirectStr);

           
        }