Conversion Error lrf -> mobi/epub (Calibre 0.6.33)

[Joerg_Mosthaf]

I just installed calibre 0.6.33 and then tried to import a lrf book from mobileread (Flatland by Edwin A Abbott).
When I try to convert it to epub (or mobi), calibre fails with the following message:

ERROR: Conversion Error: <b>Failed</b>: Convert book 1 of 1 (FLATLAND)

Convert book 1 of 1 (FLATLAND)
Resolved conversion options
{'asciiize': False,
 'author_sort': None,
 'authors': None,
 'base_font_size': 0.0,
 'book_producer': None,
 'chapter': u"//*[((name()='h1' or name()='h2') and re:test(., 'chapter|book|section|part\\s+', 'i')) or @class = 'chapter']",
 'chapter_mark': u'pagebreak',
 'comments': None,
 'cover': 'c:\\temp\\calibre_0.6.33_r9lsym.jpeg',
 'debug_pipeline': None,
 'disable_font_rescaling': False,
 'dont_justify': False,
 'dont_split_on_page_breaks': False,
 'extra_css': None,
 'extract_to': None,
 'flow_size': 260,
 'font_size_mapping': None,
 'footer_regex': u'(?i)(?<=<hr>)((\\s*<a name=\\d+></a>((<img.+?>)*<br>\\s*)?\\d+<br>\\s*.*?\\s*)|(\\s*<a name=\\d+></a>((<img.+?>)*<br>\\s*)?.*?<br>\\s*\\d+))(?=<br>)',
 'header_regex': u'(?i)(?<=<hr>)((\\s*<a name=\\d+></a>((<img.+?>)*<br>\\s*)?\\d+<br>\\s*.*?\\s*)|(\\s*<a name=\\d+></a>((<img.+?>)*<br>\\s*)?.*?<br>\\s*\\d+))(?=<br>)',
 'input_encoding': None,
 'input_profile': <calibre.customize.profiles.InputProfile object at 0x0281BF10>,
 'insert_blank_line': False,
 'insert_metadata': False,
 'isbn': None,
 'language': None,
 'level1_toc': None,
 'level2_toc': None,
 'level3_toc': None,
 'line_height': 0.0,
 'linearize_tables': False,
 'margin_bottom': 5.0,
 'margin_left': 5.0,
 'margin_right': 5.0,
 'margin_top': 5.0,
 'max_toc_links': 50,
 'no_chapters_in_toc': False,
 'no_default_epub_cover': False,
 'no_inline_navbars': False,
 'output_profile': <calibre.customize.profiles.KindleOutput object at 0x027C7230>,
 'page_breaks_before': u'/',
 'prefer_metadata_cover': False,
 'preprocess_html': False,
 'pretty_print': True,
 'publisher': None,
 'rating': None,
 'read_metadata_from_opf': 'c:\\temp\\calibre_0.6.33_j5t0vn.opf',
 'remove_first_image': False,
 'remove_footer': False,
 'remove_header': False,
 'remove_paragraph_spacing': False,
 'remove_paragraph_spacing_indent_size': 1.5,
 'series': None,
 'series_index': None,
 'tags': None,
 'title': None,
 'title_sort': None,
 'toc_filter': None,
 'toc_threshold': 6,
 'use_auto_toc': False,
 'verbose': 2}
InputFormatPlugin: LRF Input running
on D:\mosthafjoerg\My Dropbox\eBooks\Edwin A. Abbott\FLATLAND (690)\FLATLAND - Edwin A. Abbott.lrf
Generating XML
Python function terminated unexpectedly
  Malformed text stream ['CharButton'] (Error Code: 1)
Traceback (most recent call last):
  File "site.py", line 103, in main
  File "site.py", line 85, in run_entry_point
  File "site-packages\calibre\utils\ipc\worker.py", line 96, in main
  File "site-packages\calibre\gui2\convert\gui_conversion.py", line 21, in gui_convert
  File "site-packages\calibre\ebooks\conversion\plumber.py", line 745, in run
  File "site-packages\calibre\customize\conversion.py", line 208, in __call__
  File "site-packages\calibre\ebooks\lrf\input.py", line 367, in convert
  File "site-packages\calibre\ebooks\lrf\lrfparser.py", line 113, in to_xml
  File "site-packages\calibre\ebooks\lrf\objects.py", line 420, in __unicode__
  File "site-packages\calibre\ebooks\lrf\objects.py", line 606, in __unicode__
  File "site-packages\calibre\ebooks\lrf\objects.py", line 884, in __unicode__
calibre.ebooks.lrf.LRFParseError: Malformed text stream ['CharButton']

The book displays without problems in the calibre ebook-viewer.
I then searched and found a prc version of the book and tried to add it to the book in calibre and got the following error:

ERROR: ERROR: Unhandled exception: <b>TypeError</b>:coercing to Unicode: need string or buffer, NoneType found

Traceback (most recent call last):
  File "site-packages\calibre\gui2\dialogs\metadata_single.py", line 138, in add_format
  File "site-packages\calibre\gui2\dialogs\metadata_single.py", line 152, in _add_formats
TypeError: coercing to Unicode: need string or buffer, NoneType found

When I try to just add the prc to Calibre (after deleting the previous version) I get an error message about problems with the metadata, but the book itself gets imported (without any metadata) and can then be converted (but the pictures get distorted in the mobi file).
Any Idea?

[kovidgoyal]

Hard to say more without seeing the file. Open a ticket and attach it (the prc version).

[Joerg_Mosthaf]

Ok, submitted two new tickets for the two parts of the Problem.