class ‘dimadin\WP\Plugin\commonWP\Queue’ not found in

Hi Milan,

I’m hoping you might be able to shed some insight, we are getting the following errors on one site.

[09-Oct-2018 07:09:57 UTC] PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ‘dimadin\WP\Plugin\commonWP\Queue’ not found in /home/xx/xx/wp-content/plugins/mainwp-child/class/class-mainwp-child-updraft-plus-backups.php on line 1973

[09-Oct-2018 07:09:57 UTC] PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ‘dimadin\WP\Plugin\commonWP\Queue’ not found in /home/xx/xx/wp-content/plugins/mainwp-child/class/class-mainwp-child-updraft-plus-backups.php on line 1973

[09-Oct-2018 23:00:19 UTC] PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ‘dimadin\WP\Plugin\commonWP\Queue’ not found in /home/xx/xx/wp-content/themes/Divi/includes/builder/class-et-builder-element.php on line 6623

[09-Oct-2018 23:00:19 UTC] PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ‘dimadin\WP\Plugin\commonWP\Queue’ not found in /home/xx/xx/wp-content/themes/Divi/includes/builder/class-et-builder-element.php on line 6623

Active plugins are:
Advanced Custom Fields PRO
commonWP
Divi Booster
Divi Timeline Module
Duplicate Post
GP Conditional Logic Dates
GP Limit Dates
Gravity Forms
Gravity Perks
Imagify
MainWP Child
Really Simple SSL
Redirection
TinyMCE Advanced
UpdraftPlus
Wordfence Security
WP Mail SMTP
WP Rocket
WP Simple Booking Calendar
Yoast SEO

Themes:
Divi (Including Divi Builder)
A child theme of Divi

Thanks.