A WordPress Instance Clone process fails with:
PLESK_ERROR: PHP Fatal error: Uncaught Error: Class "WP_Upgrader_Skin" not found in /opt/psa/admin/plib/modules/wp-toolkit/vendor/wp-cli/vendor/wp-cli/wp-cli/php/WP_CLI/UpgraderSkin.php:13
The WordPress site may not work properly.
The WordPress dashboard is working properly.
The issue is caused by the plugin Easy Updates Manager, when the
wp-cli utility with argument
search-replace cannot de-serialize the data from the plugin table
eumlogs and fails to complete.
Disable the conflicting plugin from WordPress > example.com > Plugins and clicking the ratio button.
Note: If not needed this plugin can be removed instead.
Clone WordPress website from WordPress > example.com > Dashboard > clone
Enable back the Plugin disabled in step 2.
Alternatively: Contact Plugin's vendor support.