Question says it all. I've had no problems in the past, been using the app for a while. Recently I noticed that most of my bookmarks were missing, but my tabs were still updating. Today when I tried to troubleshoot this issue, I kept getting the above error. I tried setting up the sync sign in again (both manual and regular) as well as uninstalling and reinstalling the app. There seem to be no problems with my PC's ability to sync.