new Adldap() Timeout

[fabiodirosa]

OLD COMMENT:
Until few days ago the following code worked:

use adLDAP\adLDAP;
(...)
$ad = new Adldap(\Yii::$app->params['ldap_configuration']);

But now I have the error in subject (Class 'adLDAP\adLDAP' not found)
and the authentication doesn't work,

In composer.json I have:
"adldap/adldap": "5.0.*",

New COMMENT

Now I changed and as documentation says:
I use
use Adldap\Adldap;

but at
$ad = new Adldap(\Yii::$app->params['ldap_configuration']);

webApp goes in timeout in loadClass($class) of ClassLoader.php

Suggestions?