我在 Windows 10 上安装了 PHPPGAdmin。

Postgres 很好，我可以在命令行上登录。

但是当我尝试登录 PHPPGadmin Web UI 时出现以下错误：

Virtual Class -- cannot instantiate

这是我的 PHPPGAdmin 配置文件：

<?php  
    $conf['servers'][0]['desc'] = 'PostgreSQL';
    $conf['servers'][0]['host'] = 'localhost';
    $conf['servers'][0]['port'] = 5432;
    $conf['servers'][0]['sslmode'] = 'allow';
    $conf['servers'][0]['defaultdb'] = 'template1';
    $conf['servers'][0]['pg_dump_path'] = 'C:/xampp/PostgreSQL/13/bin/pg_dump';
    $conf['servers'][0]['pg_dumpall_path'] = 'C:/xampp/PostgreSQL/13/bin/pg_dumpall';
    $conf['default_lang'] = 'auto';
    $conf['autocomplete'] = 'default on';
    $conf['extra_login_security'] = false;
    $conf['owned_only'] = false;
    $conf['show_comments'] = true;
    $conf['show_advanced'] = false;
    $conf['show_system'] = false;
    $conf['min_password_length'] = 1;
    $conf['left_width'] = 200;
    $conf['theme'] = 'default';
    $conf['show_oids'] = false;
    $conf['max_rows'] = 30;
    $conf['max_chars'] = 50;
    $conf['use_xhtml_strict'] = false;
    $conf['help_base'] = 'http://www.postgresql.org/docs/%s/interactive/';
    $conf['ajax_refresh'] = 3;
    $conf['plugins'] = array();
    $conf['version'] = 19;   
?>

这是我的phppgadmin config 和评论。 这是我的 apache config，以防万一。

我做错了什么，我该如何纠正？