[SOLVED] custom barcode plugin

I`m trying to write a barcode plugin follow instructions from
https://xlinesoft.com/phprunner/docs/how_to_create_a_custom_edit_control.htm
But when i run application i receive the message
Fatal error: Call to undefined method ViewBarCode::addJSSetting() in E:\xampp\htdocs\barcodedemo\classes\controls\Viewbarcode.php on line 13
What i`m missing?
The Viewbarcode.php starts with
<?php
class ViewBarCode extends ViewUserControl
{
public function initUserControl()
{
//
$this->output="canvas";
$this->type="ean13";
//
if ($this->settings["output"]) $this->output=$this->settings["output"];
if ($this->settings["type"]) $this->type=$this->settings["type"];
//
$this->addJSSetting("output", $this->output);
$this->addJSSetting("type", $this->type);