My bad, i've done that now. Here's the output:
Starting up...
Started up in 1.79 seconds with 2552 books
url
http://www.fanfiction.net/s/4189811/1/Harrys_Pets) begin

None) end

None)
FanFictionDownLoader v1.5.34
url:
http://www.fanfiction.net/s/4189811/1/
=Trying newer chapter:
http://www.fanfiction.net/s/4189811/13/
Exception: {u'comment': u"invalid literal for int() with base 10: ''", u'begin':
None, u'good': False, u'end': None, u'author': u'Unknown', u'url': u'http://www
.fanfiction.net/s/4189811/1/', u'author_sort': u'Unknown', u'calibre_id': None,
u'added': False, u'title': u'Unknown'}:invalid literal for int() with base 10: '
'
Traceback (most recent call last):
File "calibre_plugins.fanfictiondownloader_plugin.dialo gs", line 308, in do_lo
op
File "calibre_plugins.fanfictiondownloader_plugin.ffdl_ plugin", line 462, in g
et_metadata_for_book
File "calibre_plugins.fanfictiondownloader_plugin.fanfi cdownloader.adapters.ba
se_adapter", line 236, in getStoryMetadataOnly
File "calibre_plugins.fanfictiondownloader_plugin.fanfi cdownloader.adapters.ad
apter_fanfictionnet", line 250, in extractChapterUrlsAndMetadata
File "calibre_plugins.fanfictiondownloader_plugin.fanfi cdownloader.story", lin
e 342, in addImgUrl
ValueError: invalid literal for int() with base 10: ''
Fetched metadata for 1 of 1
And yes, standard Language.