Issue Wordpress Toolkit: Critical error while checking for updates

[Katog Choling]

Server operating system version

Ubuntu 22.04

Plesk version and microupdate number

Plesk Obsidian v18.0.57_build1800231218.09

In the Plesk control panel for my site, the WP Toolkit is reporting this critical error whenever it checks for updates on my wordpress site. Curiously, this error doesn’t seem to happen when I check for updates manually from the WordPress Updates dashboard page. Any thoughts on what might be happening?

Failed to reset cache for the instance #1: PHP Fatal error: Cannot declare class WP_Rollback_API_Fetcher, because the name is already in use in /var/www/vhosts/mywebsite/wp-content/plugins/wp-rollback/src/class-rollback-api-requests.php on line 2
Fatal error: Cannot declare class WP_Rollback_API_Fetcher, because the name is already in use in /var/www/vhosts/mywebsite/wp-content/plugins/wp-rollback/src/class-rollback-api-requests.php on line 2
Error: There has been a critical error on this website.

 

[Martin Dias]

The error comes as the Toolkit does more checks than WP itself before updates, in this case you have plugins using classes that already exist/used.
I would recommend checking the wp-rollback plugin (from the error)