To add some more information:
1. I understand now that this is a 'recipe' problem. My apologies, I'm very new to Calibre.
2. I've looked through many recipe problems most of which seem to be about broken recipes or paywalls. I don't think this recipe is broken because it does appear to be downloading some articles as shown in the log:
Fetching
http://partsa.nikkei.jp/parts/ds/ima...tlogin_off.gif
Parsed
http://www.nikkei.com/article/DGXLAS...6A710C1000000/ in 3.8 seconds
Fetched
http://assets.nikkei.jp/release/v1.0...ayout.news.css in 0.324000 seconds
...and many more like this
3. After a while it seems to run into problems with
Recursion limit reached.
and
Initial parse failed, using more forgiving parsers
and
PropertyValue: No match: ('CHAR', u':', 1, 106153)
4. This goes on for some time and finally
Python function terminated unexpectedly
(Error Code: 1)
and
MemoryError
If anyone can help I'd be very grateful.
Thanks