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Hi @makhansingh89,
Thank you for alerting us to this error. Are there any non-traditional directory structures or renamed directories in your WP installation? From what I’ve read, this error is caused by the plugin not finding a file that is in [root html folder]/wp-includes/class-wpdb.php.
Are you able to browse and find this file directly over ftp? If so does it differ from the path where the plugin is trying to find it?
Hello, I have released a fix within version 2.2.3 or greater that should resolve this issue. Alternately, you may also update to WP version 6.1.1 or greater which should also resolve it.