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Fatal Error: Undefined Class Constant 'self::type_String'

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I am developing a module in prestashop 1.6. i extend AdminController class, everything is nice.but when i want to display the form that permit to add new instance an error message is displayed :

Fatal error: Undefined class constant 'self::TYPE_STRING' in C:\xampp\htdocs\prestashop\classes\controller\AdminController.php on line 1418
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