Only page errors are displayed before template separation

Question

base.php

<?php
namespace app\index\controller;
use think\Controller;

class Base extends Controller;
{
 
}

##index.php

<?php

namespace app\index\controller;
use app\index\controller\Base;

class Index extends Base

{
public function index()
{
return $this -> view -> fetch( );
}
}

An error occurred before the template separation step was reached. Tip:

Page error, please try again later~

Answer 1

You can change app_debug and app_trace from false to true in the configuration file config.php to clearly see the error content

Answer 2

The fetch() of your library does not indicate that view!