The error message did not tell you to reset the database, in fact the underlying error has nothing at all to do with the database.
Looks like you don’t have the error any more. In the future please actually describe what you want to do, so you can receive useful help. It’s not about “clearing an error message”, if it was that simple we just wouldn’t display the error message at all…
most of the people having this issue were on android, or just plain don’t post how they fixed it.
well, what I did was i was moving my syncthing on one end from one device to another so i can operate it over a VPN and get transfer speeds of more than 10kbps. when i moved the sharing over to the new device, using the same mounted network share, i did get this error. i did have a temporary issues with the mount, which i fixed, but then still had the error. so as best an answer i could find was to reset the DB, and have it do a full rescan.