How set up Migration in HMVC?

Hi Jailin -- Usually when I run into stuff like that it is because I did not add the namespace to the file in question; is the namespace in the file defined at the top?

My Migration file :

PHP Code:

<?php namespace Mod\System\Database\Migrations;

use CodeIgniter\Database\Migration;

class AddSystem extends Migration
{
    public function up()
    {
        $this->forge->addField([
            'id' => [
                'type' => 'bigint',
                'auto_increment' => true,
                'unsigned' => true,
                'comment' => 'PK'
            ],
            'module_id' => [
                'type' => 'bigint',
                'unsigned' => true,
                'comment' => '模組ID'
            ],
            'setting_key' => [
                'type' => 'varchar',
                'constraint' => 255,
                'null' => false,
                'default' => '',
                'comment' => '設定欄位'
            ],
            'setting_value' => [
                'type' => 'text',
                'null' => true,
                'default' => null,
                'comment' => '設定值'
            ],
            'remark' => [
                'type' => 'text',
                'null' => true,
                'default' => null,
                'comment' => '設定值說明'
            ],
            'created_at' => [
                'type' => 'TIMESTAMP',
                'null' => false,
                'comment' => '新增時間'
            ],
            'updated_at' => [
                'type' => 'TIMESTAMP',
                'null' => false,
                'comment' => '最後更新時間'
            ]
        ]);

        $attributes = ['ENGINE' => 'InnoDB', 'COMMENT' => '系統設定'];
        $this->forge->addPrimaryKey('id');
        $this->forge->addUniqueKey('setting_key');
        $this->forge->addKey('module_id');
        $this->forge->createTable('system', true, $attributes); 
    }

    //--------------------------------------------------------------------

    public function down()
    {
        //
    }
}