Fatal error: Uncaught Error WPDB

Hi guys,
I am writing you this message because I have a problem: I can no longer access the WordPress dashboard of a site I am editing. When I login, the following message appears:

Fatal error: Uncaught Error: Call to undefined method wpdb::db_server_info() in D:\inetpub\webs\luiseviniit\wp-content\plugins\chatbot\qcld-wpwbot.php:124 Stack trace: #0 D:\inetpub\webs\luiseviniit\wp-includes\class-wp-hook.php(287): qcld_wb_Chatbot->qcld_wpchatbot_init2_fnc(”) #1 D:\inetpub\webs\luiseviniit\wp-includes\class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array) #2 D:\inetpub\webs\luiseviniit\wp-includes\plugin.php(478): WP_Hook->do_action(Array) #3 D:\inetpub\webs\luiseviniit\wp-settings.php(540): do_action(‘init’) #4 D:\inetpub\webs\luiseviniit\wp-config.php(94): require_once(‘D:\inetpub\webs…’) #5 D:\inetpub\webs\luiseviniit\wp-load.php(37): require_once(‘D:\inetpub\webs…’) #6 D:\inetpub\webs\luiseviniit\wp-admin\admin.php(34): require_once(‘D:\inetpub\webs…’) #7 D:\inetpub\webs\luiseviniit\wp-admin\index.php(10): require_once(‘D:\inetpub\webs…’) #8 {main} thrown in D:\inetpub\webs\luiseviniit\wp-content\plugins\chatbot\qcld-wpwbot.php on line 124

It seems that the problem is with the Chatbot plugin, which I updated before the error appeared.

What can I do to fix it? More importantly, what should I do? I would need specific directions, if possible.
In the meantime, thank you for your help!

Veronica