Uncaught transport.js/parseResult() error: can't parse to JSON.

function check()
{
  var rec_id_Array = new Array();
  $("[name='checkboxes']:checked").each(function () {
  rec_id_Array.push($(this).val());
  });
  listTable.remove(rec_id_Array, '確定拆分訂單嗎', 'split_order');
}

listTable.remove = function(id, cfm, opt)
{
  if (opt == null)
  {
    opt = "remove";
  }

  if (confirm(cfm))
  {
    var args = "act=" + opt + "&id=" + id + this.compileFilter();

    Ajax.call(this.url, args, this.listCallback, "GET", "JSON");
  }
}

function check()
{
  var rec_id_Array = new Array();
  $("[name='checkboxes']:checked").each(function () {
  rec_id_Array.push($(this).val());
  });
  listTable.remove(rec_id_Array, '確定拆分訂單嗎', 'split_order');
}

listTable.remove = function(id, cfm, opt)
{
  if (opt == null)
  {
    opt = "remove";
  }

  if (confirm(cfm))
  {
    var args = "act=" + opt + "&id=" + id + this.compileFilter();

    Ajax.call(this.url, args, this.listCallback, "GET", "JSON");
  }
}