在代码编写器中加载库迁移时出错500

我需要你的帮助!!当我在codeigniter中加载迁移库时，返回错误500和空白页面，但如果我不加载库，我的应用程序工作

var_dump("foo1"); //print this line
$this->load->library('migration');
var_dump("foo2"); //not print this line
$this->migration->version(1);

我有var_dumps因为我想知道错误在哪里，而不是打印"foo2"所以我认为错误是在$this->load->library('migration');

库位于/system/libraries/Migration.php

在/application/config/migration.php中启用迁移$config['migration_enabled'] = TRUE;版本为$config['migration_version'] = 1;路径为default $config['migration_path'] = APPPATH。的迁移/';

我启用了错误记录，没有显示错误，我还启用了/idex.php中的所有错误报告(error_reporting(E_ALL);)，也没有显示任何东西

请帮帮我!

这是控制器类

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Home extends CI_Controller {
public function index(){
  $this->load->library('migration');
  $this->migration->version(1);
  $profile='';
  $auth = false;
  $userdata = array();
  if ($this->session->userdata('logged_in') == TRUE ) {
    $auth = true;
    $user_data = array(
      'username'=> $this->session->userdata('username'), 
      'correo'=> $this->session->userdata('correo'),
      'mensaje' => $this->session->userdata('mensaje'),
      'profile' => $this->session->userdata('profile'),
      'profile_id' => $this->session->userdata('profile_id'),
      'result' => $this->session->userdata('result'),
      'rut' => $this->session->userdata('rut'),
      'logged_in' => $this->session->userdata('logged_in')
    );
    $userdata = $user_data;
    $profile = $this->session->userdata('profile');
  }
  $data = array('auth' => $auth, 'profile' => $profile, 'userdata'=> $userdata);
  $this->load->view('home', $data);
}
}
?>