You should definitely exclude the recycle bin from sync. Add $RECYCLE.BIN to the file .stignore on that drive (create that file if it does not exist or use the ignore patterns when editing the folder in Syncthing.
You should also exclude all other system folders like System Volume Information.
After that restart Syncthing on both devices and the error should be cleared.
As this is not your system drive and only contains data files, I think there should not be a real problem syncing it.
By the way: This has nothing to do with SyncTrayzor just Syncthing itself.