Kdjykuj

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

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


Here's what i done:

etc/adminhtml/system.xml

<?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">

    <system>

        <section id="gssi_career" translate="label" sortOrder="150" showInDefault="1" showInWebsite="1" showInStore="1">

            <class>separator-top</class>

            <label>Careers</label>

            <tab>gssi</tab>

            <resource>Gssi_Contact::contact_config</resource>



            <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>

                    <frontend_model>GssiCareerBlockSystemConfigFormFieldFields</frontend_model>

                    <backend_model>MagentoConfigModelConfigBackendSerializedArraySerialized</backend_model>

                </field>

            </group>



        </section>



    </system>

</config>

GssiCareerBlockSystemConfigFormFieldFields

<?php   

namespace GssiCareerBlockSystemConfigFormField;



use MagentoConfigBlockSystemConfigFormFieldFieldArrayAbstractFieldArray;



/**

 * Class Active

 *

 * @package GssiContactBlockSystemConfigFormField

 */

class Fields extends AbstractFieldArray {



    /**

     * @var bool

     */

    protected $_addAfter = TRUE;



    /**

     * @var

     */

    protected $_addButtonLabel;



    /**

     * Construct

     */

    protected function _construct() {

        parent::_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');

    }

}