I'm getting this error, even though I haven't changed anything about my setup. I've already tried rebooting, resetting the sync location, restoring preferences from a backup in various locations (the one in the error message, Application Support, etc.).
My workflows, snippets, etc. are just gone!
"You have a sync location set, but the preferences package is missing from:
~/Library/Mobile Documents/com~apple~CloudDocs/Alfred
This could be due to the Volume not yet being mounted, or the preferences being deleted.
If you continue, Alfred will use the default preferences location."