I found out the problem now. I saw this Post by manofdogz and UltimateJim’s reply. Turned off “Minify CSS and Javascript” and now it exports, as per normal.
It is a large site, but not what I would call extremely large. The site comprises of Stacks, FormLoom3, RapidMaps and the usual Plugins made by RapidWeaver (i.e. Blog and Site Map). The theme I am using is Elixir Graphic’s Ruby Theme.
All works well now, however, I still do not understand the reasoning behind it crashing. Maybe it’s too much for RapidWeaver. 1611mac: Have you tried turning off “Minify CSS and Javascript”?