Category not work, HELP!

[loyalconsult]

Hello, when i install prestashop 1.6 whit default theme and try to delete demo categorys and create my apear this error:

 

Root category must be an integer value
at line 212 in file classes/helper/HelperTreeCategories.php

207.     }
208. 
209.     public function setRootCategory($value)
210.     {
211.         if (!Validate::isInt($value)) {
212.             throw new PrestaShopException('Root category must be an integer value');
213.         }
214. 
215.         $this->_root_category = $value;
216.         return $this;
217.     }

• HelperTreeCategoriesCore->setRootCategory - [line 2504 - controllers/admin/AdminProductsController.php] - [1 Arguments]
• AdminProductsControllerCore->initContent - [line 189 - classes/controller/Controller.php]
• ControllerCore->run - [line 367 - classes/Dispatcher.php]
• DispatcherCore->dispatch - [line 58 - admin/index.php]

 

This guys have the same problem and record videos:

https://www.youtube.com/watch?v=yIgTpzu_OFM

 

PLEASE HELP!