From the Recaller Wiki page:

If you encounter a problem with the widget, please remove/delete it from the Home screen, then open X-Term and launch the widget manually by typing:

python2.5 /usr/lib/hildon-desktop/recaller.py

You can now see some output from the widget. Now switch to the Home screen and work with the widget - you can then control the output in X-Term and report any errors visible.