Please, will you help me?

I had been to access a Joomla site but It show this alert messages:

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/web_site/libraries/cms/application/cms.php on line 471

if (count($sessionQueue))

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/web_site/libraries/joomla/updater/updater.php on line 278

if (array_key_exists('update_sites', $update_result) && count($update_result))

Please, will you help to fix the error alert.

Thanks a lot, regards.

Thanks, I understood.

Regards Fotis.