Cant convert to Mobi

[Lars_G]

For many many versions now, on one of my machines I'm entirely unable to convert any format to mobi. When I try after the conversion finishes I get an error.

Here is the full error in case someone can help. This is a real bummer for feeding my kindle:

calibre, version 0.8.24
ERROR: Conversion Error: <b>Failed</b>: Convert book 1 of 1 (empire)

Convert book 1 of 1 (empire)
Resolved conversion options
calibre version: 0.8.24
{'asciiize': False,
'author_sort': None,
'authors': None,
'base_font_size': 0.0,
'book_producer': None,
'change_justification': u'original',
'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': '/tmp/calibre_0.8.24_tmp_cKxpX9/kQmkJd.jpeg',
'debug_pipeline': None,
'dehyphenate': True,
'delete_blank_paragraphs': True,
'disable_font_rescaling': False,
'dont_compress': False,
'duplicate_links_in_toc': False,
'enable_heuristics': False,
'extra_css': None,
'extract_to': None,
'fix_indents': True,
'font_size_mapping': None,
'format_scene_breaks': True,
'html_unwrap_factor': 0.4,
'input_encoding': None,
'input_profile': <calibre.customize.profiles.InputProfile object at 0xacea48c>,
'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': 0.0,
'linearize_tables': 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,
'mobi_ignore_margins': False,
'mobi_toc_at_start': False,
'no_chapters_in_toc': False,
'no_inline_navbars': True,
'no_inline_toc': False,
'output_profile': <calibre.customize.profiles.KindleOutput object at 0xaceadec>,
'page_breaks_before': u"//*[name()='h1' or name()='h2']",
'personal_doc': u'[PDOC]',
'prefer_author_sort': False,
'prefer_metadata_cover': False,
'pretty_print': False,
'pubdate': None,
'publisher': None,
'rating': None,
'read_metadata_from_opf': '/tmp/calibre_0.8.24_tmp_cKxpX9/UchAmR.opf',
'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': u'',
'rescale_images': False,
'series': None,
'series_index': None,
'share_not_sync': False,
'smarten_punctuation': False,
'sr1_replace': None,
'sr1_search': None,
'sr2_replace': None,
'sr2_search': None,
'sr3_replace': None,
'sr3_search': None,
'tags': None,
'timestamp': None,
'title': None,
'title_sort': None,
'toc_filter': None,
'toc_threshold': 6,
'toc_title': None,
'unsmarten_punctuation': False,
'unwrap_lines': True,
'use_auto_toc': False,
'verbose': 2}
InputFormatPlugin: EPUB Input running
on /tmp/calibre_0.8.24_tmp_cKxpX9/yAm2IJ.epub
Found HTML cover titlepage.xhtml
Parsing all content...
Parsing index_split_001.html ...
Parsing index_split_005.html ...
Parsing index_split_006.html ...
Parsing index_split_000.html ...
Parsing index_split_002.html ...
Parsing stylesheet.css ...
Parsing index_split_007.html ...
Parsing index_split_003.html ...
Parsing index_split_004.html ...
Parsing titlepage.xhtml ...
Reading TOC from NCX...
Merging user specified metadata...
Detecting structure...
Flattening CSS and remapping font sizes...
Source base font size is 12.00000pt
Removing fake margins...
Parsing stylesheet1.css ...
Found 3916 items of level: p_1
p_1 left margin stats: Counter({u'0': 3916})
p_1 right margin stats: Counter({u'0': 3916})
Cleaning up manifest...
Trimming unused files from manifest...
Trimming 'cover.jpeg' from manifest
Trimming 'titlepage.xhtml' from manifest
Creating MOBI Output...
Generating in-line TOC...
Applying case-transforming CSS...
Parsing manglecase.css ...
Parsing tocstyle.css ...
Rasterizing SVG images...
Converting XHTML to Mobipocket markup...
Serializing images...
Serializing markup content...
Compressing markup content...
Generating MOBI index for a book
TOC item Start [titlepage.xhtml] not found in document
Failed to generate MOBI index:
Traceback (most recent call last):
File "site-packages/calibre/ebooks/mobi/writer2/main.py", line 114, in generate_index
File "site-packages/calibre/ebooks/mobi/writer2/indexer.py", line 508, in __init__
ValueError: No valid entries in TOC, cannot generate index

MOBI output written to /tmp/calibre_0.8.24_tmp_cKxpX9/KaPdqv.mobi
ICE default IO error handler doing an exit(), pid = 22174, errno = 32

[kovidgoyal]

https://www.mobileread.com/forums/sho...d.php?t=147431