{
    "title": [
        "Field cannot be empty."
    ],
    "category": [
        "Value must be 0 or more."
    ],
    "addresses": [
        {
            "street": [
                "Field cannot be empty."
            ]
        }
    ]
}

    public function getErrorsAsArray($form)
    {
        $errors = array();
        foreach ($form->getErrors() as $error) {
            $errors[] = $error->getMessage();
        }
        foreach ($form->all() as $key => $child) {
            if ($err = $this->getErrorsAsArray($child)) {
                $errors[$key] = $err;
            }
        }
        return $errors;
    }