Text of message from Syncthing:
2019-09-06 22:51:11: Watching for changes encountered an event outside of the filesystem root: f.root==\?\C:\Etc\Dev, root==\?\f:\dev, path==\?\c:\etc\dev. This should never happen, please report this message to forum.syncthing.net.
It should be noted that on my system, C:\Etc\Dev is a directory junction that points to F:\Dev . Syncthing has C:\Etc\Dev as a shared folder.