Hello @Vincent N
Thank you for reaching out to the Community regarding your issue, although I am sorry to hear that you are experiencing issues with your sync. Generally when we're getting the error you're receiving we'll want to reset the cloud as ideally it should clean up the error you're receiving. I'll leave steps down below.
Once you get a chance to try these steps, please let us know what you find. From there we'll better understand our next steps/options.
Thanks,
Quicken Francisco