Troubleshooting Sync the database schema In rare situations, the WordPress database schema might not match the schema expected by the applications or plugin. For example switching to multisite, and the wp_users table is missing the spam and deleted colums To fix this issue locally, create a file in the mu-plugins folder such as mu-plugins/db-upgrade.php with the following contents, and load the site: 1.1.2 <= 2.0 and can be fixed by downgrading to 1.1.2 # Pin version to 1.1.2 composer require oomphinc/composer-installers-extender 1.1.2 --no-update --no-plugins # Update the plugin composer update oomphinc/composer-installers-extender --no-plugins # Update dependencies composer update oomphinc/composer-installers-extender