Shipping method not appear in admin page

[beabay]

I have added the shipping method as described in this documentation:
https://devdocs.bagisto.com/12.x/advanced/create-shipping-method.html
this folder is generated after I use:
php artisan package:make-shipping-method Webkul/RajaOngkir

However, the shipping method does not appear in the configure tab.

This is the code that was automatically generated from the documentation.

// Carriers/RajaOngkir.php
<?php

namespace Webkul\RajaOngkir\Carriers;

use Webkul\Shipping\Carriers\AbstractShipping;
use Webkul\Checkout\Models\CartShippingRate;

class RajaOngkir extends AbstractShipping
{
    /**
     * Shipping method code
     *
     * @var string
     */
    protected $code  = 'rajaongkir';

    /**
     * Returns rate for shipping method
     *
     * @return CartShippingRate|false
     */
    public function calculate()
    {
        if (! $this->isAvailable()) {
            return false;
        }

        $object = new CartShippingRate;

        $object->carrier = 'rajaongkir';
        $object->carrier_title = $this->getConfigData('title');
        $object->method = 'rajaongkir_rajaongkir';
        $object->method_title = $this->getConfigData('title');
        $object->method_description = $this->getConfigData('description');
        $object->price = 0;
        $object->base_price = 0;

        return $object;
    }
}

// Config/carriers.php
<?php

return [
    'rajaongkir' => [
        'code'         => 'rajaongkir',
        'title'        => 'RajaOngkir',
        'description'  => 'RajaOngkir',
        'active'       => true,
        'default_rate' => '10',
        'type'         => 'per_unit',
        'class'        => 'Webkul\RajaOngkir\Carriers\RajaOngkir',
    ],
];

// Config/system.php
<?php

return [
    [
        'key'    => 'sales.carriers.rajaongkir',
        'name'   => 'RajaOngkir',
        'sort'   => 1,
        'fields' => [
            [
                'name'          => 'title',
                'title'         => 'admin::app.admin.system.title',
                'type'          => 'text',
                'validation'    => 'required',
                'channel_based' => false,
                'locale_based'  => true,
            ], [
                'name'          => 'description',
                'title'         => 'admin::app.admin.system.description',
                'type'          => 'textarea',
                'channel_based' => false,
                'locale_based'  => true,
            ], [
                'name'          => 'active',
                'title'         => 'admin::app.admin.system.status',
                'type'          => 'boolean',
                'validation'    => 'required',
                'channel_based' => false,
                'locale_based'  => true,
            ]
        ]
    ]
];

// RajaOngkirServiceProviders.php
<?php

namespace Webkul\RajaOngkir\Providers;

use Illuminate\Support\ServiceProvider;

class RajaOngkirServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap services.
     *
     * @return void
     */
    public function boot()
    {
    }

    /**
     * Register services.
     *
     * @return void
     */
    public function register()
    {
        $this->registerConfig();
    }
    
    /**
     * Register package config.
     *
     * @return void
     */
    protected function registerConfig()
    {
        $this->mergeConfigFrom(
            dirname(__DIR__) . '/Config/carriers.php', 'carriers'
        );

        $this->mergeConfigFrom(
            dirname(__DIR__) . '/Config/system.php', 'core'
        );
    }
}

i already add namespace in composer.json and register the service provider in Config\app.php

[beabay]

sorry wrong link
the documentation that i use is
https://devdocs.bagisto.com/2.3/advanced/create-shipping-method.html#introduction

i tried to redo with the manual step and now i got this error

Cannot access offset of type string on string

i don't know where is it from

[beabay]

i already solve it!

If you want the code to work, you have to add

• more square brackets covering the return value in Config/system.php
  before :

return 
[
    'key'=>'blablabla'
    // other keys => values
]

after

return 
[
     [
      'key'=>'blablabla'
       // other keys => values
     ]
]

• 'info' key in Config/system.php
  before :

'key'    => 'sales.carriers.raja_ongkir',
'name'   => 'admin::app.configuration.index.sales.shipping-methods.raja-ongkir-shipping.page-title',
'sort'   => 2,
'fields' => [
// field keys => values
]

after

'key'    => 'sales.carriers.raja_ongkir',
'name'   => 'admin::app.configuration.index.sales.shipping-methods.raja-ongkir-shipping.page-title',
'info'   => 'admin::app.configuration.index.sales.shipping-methods.raja-ongkir-shipping.title-info',
'sort'   => 2,
'fields' => [

and dont forget to add the service provider in providers.php and add the namespaces to composer.json (from documentation)

"autoload": {
    ...
    "psr-4": {
        // Other PSR-4 namespaces
        "Webkul\\CustomShippingMethod\\": "packages/Webkul/CustomShippingMethod/src"
    }
}