I'm trying to make a custom store configuration with ArraySerialized
But at first, i try with 2 column and it working fine, i've successfully in created and get data from it, but then, i created 1 more column, and this issue show up enter image description here

I've searched a lot but still no luck, please help

Here's what i done:


<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
        <section id="gssi_career" translate="label" sortOrder="150" showInDefault="1" showInWebsite="1" showInStore="1">

            <group id="gssi_career_group" translate="label" type="text" sortOrder="30" showInDefault="1" showInWebsite="1" showInStore="1">
                <label>Career Subject</label>
                <field id="gssi_career_field" translate="label" sortOrder="0" showInDefault="1" showInWebsite="1" showInStore="1">
                    <label>List Careers</label>




namespace Gssi\Career\Block\System\Config\Form\Field;

use Magento\Config\Block\System\Config\Form\Field\FieldArray\AbstractFieldArray;

 * Class Active
 * @package Gssi\Contact\Block\System\Config\Form\Field
class Fields extends AbstractFieldArray {

     * @var bool
    protected $_addAfter = TRUE;

     * @var
    protected $_addButtonLabel;

     * Construct
    protected function _construct() {
        $this->_addButtonLabel = __('Add');

     * Prepare to render the columns
    protected function _prepareToRender() {
        $this->addColumn('subject_code', ['label' => __('Subject Code')]);
        $this->addColumn('subject_label', ['label' => __('Subject Label')]);
        $this->addColumn('subject_email', ['label' => __('Subject Email')]);
        $this->_addAfter       = FALSE;
        $this->_addButtonLabel = __('Add');

1 Answer 1


Simple....Remove your config entry in core_config_data. Try adding all columns at a time in protected function _prepareToRender() and run upgrade, compile and flush commands

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