[realbase]

I just tried to remove the 'convert'-part, since I don't understand why I use it.
(I'm a newbie, thats why )

This is the code i tried to use.

#!/usr/bin/env  python2
# -*- coding: utf-8 -*-
#Based on veezh's original recipe and Kovid Goyal's New York Times recipe and Snaab's NRC-epub recipe

__license__   = 'GPL v3'
__copyright__ = '2013, RealBase'

'''
www.groene.nl
'''
import os, zipfile
import time
from calibre.web.feeds.news import BasicNewsRecipe
from calibre.ptempfile import PersistentTemporaryFile
from calibre.ebooks.conversion.cli import main

class GroeneAmsterdammer(BasicNewsRecipe):

    title = u'De Groene Amsterdammer'
    description = u'De ePub-versie van de Groene Amsterdammer'
    language = 'nl'
    lang = 'nl-NL'
    needs_subscription = True

    __author__ = 'Realbase'

    conversion_options = {
        'no_default_epub_cover' : True
    }

    def get_browser(self):
        br = BasicNewsRecipe.get_browser(self)
        if self.username is not None and self.password is not None:
            br.open('https://www.groene.nl/sessie/new')
            print [form for form in br.forms()][1]          
            br.select_form(nr=1)
            br['user_session[login]']   = self.username
            br['user_session[password]'] = self.password
            br.submit()
        return br

    def build_index(self):

        domain = "http://www.groene.nl"

        url = domain + "/deze-week.epub"
        #print url

        try:
            br = self.get_browser()
            f = br.open(url)

        except:
            self.report_progress(0,_('Kan niet inloggen om editie te downloaden'))
            raise ValueError('Groene van deze week nog niet beschikbaar')

        tmp = PersistentTemporaryFile(suffix='.epub')
        self.report_progress(0,_('downloading epub'))
        tmp.write(f.read())
        f.close()
        br.close()
        tmp.close()

        index = os.path.join(self.output_dir, 'metadata.opf')
       
	
        return index

Then I get this error

Download nieuws van De Groene Amsterdammer
Resolved conversion options
calibre version: 0.9.23
{'asciiize': False,
 'author_sort': None,
 'authors': None,
 'base_font_size': 0,
 'book_producer': None,
 'change_justification': 'original',
 'chapter': None,
 'chapter_mark': 'pagebreak',
 'comments': None,
 'cover': None,
 'debug_pipeline': None,
 'dehyphenate': True,
 'delete_blank_paragraphs': True,
 'disable_font_rescaling': False,
 'dont_download_recipe': False,
 'dont_split_on_page_breaks': True,
 'duplicate_links_in_toc': False,
 'embed_font_family': None,
 'enable_heuristics': False,
 'epub_flatten': False,
 'extra_css': None,
 'extract_to': None,
 'filter_css': None,
 'fix_indents': True,
 'flow_size': 260,
 'font_size_mapping': None,
 'format_scene_breaks': True,
 'html_unwrap_factor': 0.4,
 'input_encoding': None,
 'input_profile': <calibre.customize.profiles.InputProfile object at 0x108249590>,
 'insert_blank_line': False,
 'insert_blank_line_size': 0.5,
 'insert_metadata': False,
 'isbn': None,
 'italicize_common_cases': True,
 'keep_ligatures': False,
 'language': None,
 'level1_toc': None,
 'level2_toc': None,
 'level3_toc': None,
 'line_height': 0,
 'linearize_tables': False,
 'lrf': False,
 'margin_bottom': 5.0,
 'margin_left': 5.0,
 'margin_right': 5.0,
 'margin_top': 5.0,
 'markup_chapter_headings': True,
 'max_toc_links': 50,
 'minimum_line_height': 120.0,
 'no_chapters_in_toc': False,
 'no_default_epub_cover': False,
 'no_inline_navbars': False,
 'no_svg_cover': False,
 'output_profile': <calibre.customize.profiles.KoboReaderOutput object at 0x108249d10>,
 'page_breaks_before': None,
 'prefer_metadata_cover': False,
 'preserve_cover_aspect_ratio': False,
 'pretty_print': True,
 'pubdate': None,
 'publisher': None,
 'rating': None,
 'read_metadata_from_opf': None,
 'remove_fake_margins': True,
 'remove_first_image': False,
 'remove_paragraph_spacing': False,
 'remove_paragraph_spacing_indent_size': 1.5,
 'renumber_headings': True,
 'replace_scene_breaks': '',
 'search_replace': None,
 'series': None,
 'series_index': None,
 'smarten_punctuation': False,
 'sr1_replace': '',
 'sr1_search': '',
 'sr2_replace': '',
 'sr2_search': '',
 'sr3_replace': '',
 'sr3_search': '',
 'start_reading_at': None,
 'subset_embedded_fonts': False,
 'tags': None,
 'test': False,
 'timestamp': None,
 'title': None,
 'title_sort': None,
 'toc_filter': None,
 'toc_threshold': 6,
 'unsmarten_punctuation': False,
 'unwrap_lines': True,
 'use_auto_toc': False,
 'verbose': 2}
Python function terminated unexpectedly: 'NoneType' object has no attribute 'rfind'
InputFormatPlugin: Recipe Input running
Using custom recipe
<POST https://www.groene.nl/sessie application/x-www-form-urlencoded
  <HiddenControl(authenticity_token=*****=) (readonly)>
  <TextControl(user_session[login]=)>
  <PasswordControl(user_session[password]=)>
  <SubmitControl(commit=Login) (readonly)>>
<POST https://www.groene.nl/sessie application/x-www-form-urlencoded
  <HiddenControl(authenticity_token=*****=) (readonly)>
  <TextControl(user_session[login]=)>
  <PasswordControl(user_session[password]=)>
  <SubmitControl(commit=Login) (readonly)>>
Parsing all content...
Traceback (most recent call last):
  File "/Applications/calibre.app/Contents/Resources/Python/lib/python2.7/site.py", line 147, in main
    return run_entry_point()
  File "/Applications/calibre.app/Contents/Resources/Python/lib/python2.7/site.py", line 116, in run_entry_point
    return getattr(pmod, func)()
  File "site-packages/calibre/utils/ipc/worker.py", line 189, in main
  File "site-packages/calibre/gui2/convert/gui_conversion.py", line 25, in gui_convert
  File "site-packages/calibre/ebooks/conversion/plumber.py", line 1018, in run
  File "site-packages/calibre/ebooks/conversion/plumber.py", line 1183, in create_oebbook
  File "site-packages/calibre/ebooks/oeb/reader.py", line 67, in __call__
  File "site-packages/calibre/ebooks/oeb/base.py", line 458, in __init__
  File "lib/python2.7/posixpath.py", line 96, in splitext
  File "lib/python2.7/genericpath.py", line 91, in _splitext
AttributeError: 'NoneType' object has no attribute 'rfind'