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From one of my earlier replies:
“If you want to find your Apache error log, you can probably find it in your hosting control panel, or you can find it via https://ftp.”

There are a number of control panels and ftp folder structures, so it’s hard to say exactly where to find the error logs. That’s a question for your hosting company or their support documents. Google can also be helpful. You can start by looking for anything with the word “logs” in your control panel. In ftp, the error log is normally called error_log and is normally found in the root folder of your site, which is normally inside the “public_html” or “www” folder.

This is the error present in error log

[Fri Dec 12 19:56:10 2014] [error] [client 78.46.94.23:34308] – https://www.ildexperience.com – AH01215: \x01WordPress errore sul database \x02Unknown column ‘spam’ in ‘where clause’\x04 per la query \x02SELECT ID FROM wp_users WHERE ID=1 AND spam != 1\x04 fatta da \x02require(‘wp-blog-header.php’), require_once(‘wp-includes/template-loader.php’), include(‘/themes/kleo/buddypress.php’), get_template_part, locate_template, load_template, require(‘/themes/kleo/page-parts/general-after-wrap.php’), do_action(‘kleo_after_content’), call_user_func_array, kleo_sidebar, get_sidebar, locate_template, load_template, require_once(‘/themes/kleo/sidebar.php’), generated_dynamic_sidebar, sidebar_generator::get_sidebar, dynamic_sidebar, call_user_func_array, WP_Widget->display_callback, TDLCBirthdaysWidget->widget, TDLCBirthday->printAllBirthdays, TDLCBirthday->printBirthdays\x04\x03

I’m not sure if it can be useful, but this is present as an error.
I await your suggestions kindly.

Thank you for the attention given to and remaining available to every and any further clarification, I greet you cordially.