Rhaid i chi benodi o leiaf un plygell fel ffynhonnell, naill ai wrth ddewis y plygellau'n unigol, ac/neu wrth ddewis bob plygell lleol, bob plygell pell, neu'r ddau.
You must specify at least one folder as a source. Either by selecting the folders individually, and/or by selecting all local folders, all remote folders, or both.