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JTL WaWi connection / [PrestaShopException] Root category must be an integer value


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I need some urgent help. We connected JTL WaWi to Prestashop

After working for a while I now experience this error messages when clicking to "articles". Shop is empty so far.

How can this be solved? Am thankful for any hint.


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.     }
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