You need to make a small adjustment on your application to make the custom error pages work in Laravel. Laravel uses the internal error pages by default if you don't modify the exception handler. The following solution will work for Laravel 5.x, Laravel 6.x and so on..

Enabling custom error pages in Laravel:

1) You need to generate the error pages blade view files in your project. You can do this by using this command. It will generate the blade error view files in your ressources view directory:

php artisan vendor:publish --tag=laravel-errors

2) Modify the the exception handler to make Laravel load your custom blade error templates. The file is located here: app/Exceptions/Handler.php.

/**
 * Render an exception
 *
 * @param  \Illuminate\Http\Request  $request
 * @param  \Exception  $exception
 * @return \Symfony\Component\HttpFoundation\Response
 *
 * @throws \Exception
 */
public function render($request, Exception $exception)
{
    if ($this->isHttpException($exception)) {
        return $this->renderHttpException($exception);
    } else {
        return parent::render($request, $exception);
    }
}