eDirectory：Settings.php第79行中的异常：无法找到此eDirectory安装的主机localhost

I get this error when I visit any page (http://localhost:8000/config.php) of a customized eDirectory app.

2/2
Exception in Settings.php line 79:
Cannot find host localhost for this eDirectory installation

in Settings.php line 79
at Settings->setActiveHost('localhost') in Settings.php line 38

With a 29 line stack trace. This is line 38

    $domain = $this->container->get("kernel")->getDomain() and $this->setActiveHost($domain);

This is line 75-80

    if (isset($this->hostConfig[$activeHost])) {
        $this->activeHost = $activeHost;
    } else {
        $this->container->get('logger')->critical("[MultiDomain/Settings] - Unable to set Active Host.");
        throw new \Exception(sprintf('Cannot find host %s for this eDirectory installation', $activeHost));
    }

Symfony 2.8, PHP 5.6.27

I change the following line in app/config/domain.yml

From

multi_domain:
    hosts:
        staging.wisher.com:

To

multi_domain:
    hosts:
        localhost: