[plugin: BSW Gallery] Gallery landing page not found. Gallery posts ok

Hi,
I’ve installed the gallery plugin and uploaded 2 test galleris.
The problem is that the gallery main page is not found:
http://lifford.donegalbordervillages.com/gallery/
but the single gallery pages are fine:
http://lifford.donegalbordervillages.com/gallery/lifford-gallery/

I checked the pages and they are all fine.
Last time I used this plug in it worked fine and I can’t see what I’m doing wrong. I’ve uninstalled and re-installed it. not sure what else to try.