i have the following code for create a class but when the class with his costructor get load i get an error:

```
    Class DropDown {
        public function __construct() 
        {
            if ( ! function_exists('form'))
            {
(line 11)   $this->load->helper('form');
            }
        }

```

and the error

```
A PHP Error was encountered

Severity: Notice

Message: Undefined property: DropDown::$load

Filename: helpers/dropdown_helper.php

Line Number: 11

```

Thanks all in advance