[stepk]

I run portable calibre on Windows. The database holds about 400 book records. Calibre conversion from any format to mobi (and to other formats) always fails with this kind of log:

Python function terminated unexpectedly
'bool' object is not iterable (Error Code: 1)
Traceback (most recent call last):
File "site.py", line 132, in main
File "site.py", line 109, in run_entry_point
File "site-packages\calibre\utils\ipc\worker.py", line 186, in main
File "site-packages\calibre\gui2\convert\gui_conversion.py", line 31, in gui_convert_override
File "site-packages\calibre\gui2\convert\gui_conversion.py", line 25, in gui_convert
File "site-packages\calibre\ebooks\conversion\plumber.py", line 1049, in run
File "site-packages\calibre\ebooks\oeb\transforms\structure.p y", line 33, in __call__
File "site-packages\calibre\ebooks\oeb\transforms\structure.p y", line 124, in detect_chapters
TypeError: 'bool' object is not iterable

full log

Spoiler:

calibre Debug log
calibre 0.9.8 Portable isfrozen: True
Windows-7-6.1.7601-SP1 Windows
('Windows', '7', '6.1.7601')
Python 2.7.3
Windows: ('7', '6.1.7601', 'SP1', 'Multiprocessor Free')
Starting up...
Started up in 28.96 seconds with 243 books
Worker Launch took: 1.30099987984
Job: 1 Convert book 1 of 1 (Testing Conversion) finished
Convert book 1 of 1 (Testing Conversion)
Resolved conversion options
calibre version: 0.9.8
{'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(., '\\s*((chapter|book|section|part|kap|liber|sek)\\s +)|((prolog|prologue|epilogue|prol|epyl)(\\s+|$))' , 'i')) or @class = 'chapter'] or name() = 'chapter'",
'chapter_mark': u'pagebreak',
'comments': None,
'cover': u'C:\\Users\\user\\AppData\\Local\\Temp\\calibre_0 .9.8_tmp_enxnik\\sujxlz.jpeg',
'debug_pipeline': None,
'dehyphenate': True,
'delete_blank_paragraphs': True,
'disable_font_rescaling': False,
'dont_compress': False,
'duplicate_links_in_toc': False,
'embed_font_family': None,
'enable_heuristics': False,
'extra_css': None,
'extract_to': None,
'filter_css': u'',
'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 0x04654050>,
'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': u'//h:h1',
'level2_toc': u'//h:h2',
'level3_toc': u'//h:h3',
'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_file_type': u'old',
'mobi_ignore_margins': False,
'mobi_keep_original_images': False,
'mobi_toc_at_start': False,
'new_pdf_engine': False,
'no_chapters_in_toc': False,
'no_images': False,
'no_inline_navbars': True,
'no_inline_toc': False,
'output_profile': <calibre.customize.profiles.KindleOutput object at 0x04654390>,
'page_breaks_before': u"//*[name()='h1' or name()='h2']",
'personal_doc': u'[PDOC]',
'prefer_author_sort': False,
'prefer_metadata_cover': True,
'pretty_print': False,
'pubdate': None,
'publisher': None,
'rating': None,
'read_metadata_from_opf': u'C:\\Users\\user\\AppData\\Local\\Temp\\calibre_0 .9.8_tmp_enxnik\\ghri7w.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'',
'search_replace': '[]',
'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,
'start_reading_at': None,
'subset_embedded_fonts': False,
'tags': None,
'timestamp': None,
'title': None,
'title_sort': None,
'toc_filter': None,
'toc_threshold': 6,
'toc_title': None,
'unsmarten_punctuation': False,
'unwrap_factor': 0.45,
'unwrap_lines': True,
'use_auto_toc': False,
'verbose': 2}
InputFormatPlugin: PDF Input running
on C:\Users\user\AppData\Local\Temp\calibre_0.9.8_tmp _enxnik\llbqlh.pdf
Converting file to html...
Retrieving document metadata...
Generating manifest...
Rendering manifest...
Parsing all content...
Parsing index.html ...
Initial parse failed, using more forgiving parsers
Parsing index.html as HTML
Generating default TOC from spine...
Merging user specified metadata...
Detecting structure...
Python function terminated unexpectedly
'bool' object is not iterable (Error Code: 1)
Traceback (most recent call last):
File "site.py", line 132, in main
File "site.py", line 109, in run_entry_point
File "site-packages\calibre\utils\ipc\worker.py", line 186, in main
File "site-packages\calibre\gui2\convert\gui_conversion.py", line 31, in gui_convert_override
File "site-packages\calibre\gui2\convert\gui_conversion.py", line 25, in gui_convert
File "site-packages\calibre\ebooks\conversion\plumber.py", line 1049, in run
File "site-packages\calibre\ebooks\oeb\transforms\structure.p y", line 33, in __call__
File "site-packages\calibre\ebooks\oeb\transforms\structure.p y", line 124, in detect_chapters
TypeError: 'bool' object is not iterable

Convert book 1 of 1 (Testing Conversion)
Resolved conversion options
calibre version: 0.9.8
{'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(., '\\s*((chapter|book|section|part|kap|liber|sek)\\s +)|((prolog|prologue|epilogue|prol|epyl)(\\s+|$))' , 'i')) or @class = 'chapter'] or name() = 'chapter'",
'chapter_mark': u'pagebreak',
'comments': None,
'cover': u'C:\\Users\\user\\AppData\\Local\\Temp\\calibre_0 .9.8_tmp_enxnik\\sujxlz.jpeg',
'debug_pipeline': None,
'dehyphenate': True,
'delete_blank_paragraphs': True,
'disable_font_rescaling': False,
'dont_compress': False,
'duplicate_links_in_toc': False,
'embed_font_family': None,
'enable_heuristics': False,
'extra_css': None,
'extract_to': None,
'filter_css': u'',
'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 0x04654050>,
'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': u'//h:h1',
'level2_toc': u'//h:h2',
'level3_toc': u'//h:h3',
'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_file_type': u'old',
'mobi_ignore_margins': False,
'mobi_keep_original_images': False,
'mobi_toc_at_start': False,
'new_pdf_engine': False,
'no_chapters_in_toc': False,
'no_images': False,
'no_inline_navbars': True,
'no_inline_toc': False,
'output_profile': <calibre.customize.profiles.KindleOutput object at 0x04654390>,
'page_breaks_before': u"//*[name()='h1' or name()='h2']",
'personal_doc': u'[PDOC]',
'prefer_author_sort': False,
'prefer_metadata_cover': True,
'pretty_print': False,
'pubdate': None,
'publisher': None,
'rating': None,
'read_metadata_from_opf': u'C:\\Users\\user\\AppData\\Local\\Temp\\calibre_0 .9.8_tmp_enxnik\\ghri7w.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'',
'search_replace': '[]',
'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,
'start_reading_at': None,
'subset_embedded_fonts': False,
'tags': None,
'timestamp': None,
'title': None,
'title_sort': None,
'toc_filter': None,
'toc_threshold': 6,
'toc_title': None,
'unsmarten_punctuation': False,
'unwrap_factor': 0.45,
'unwrap_lines': True,
'use_auto_toc': False,
'verbose': 2}
InputFormatPlugin: PDF Input running
on C:\Users\user\AppData\Local\Temp\calibre_0.9.8_tmp _enxnik\llbqlh.pdf
Converting file to html...
Retrieving document metadata...
Generating manifest...
Rendering manifest...
Parsing all content...
Parsing index.html ...
Initial parse failed, using more forgiving parsers
Parsing index.html as HTML
Generating default TOC from spine...
Merging user specified metadata...
Detecting structure...
Python function terminated unexpectedly
'bool' object is not iterable (Error Code: 1)
Traceback (most recent call last):
File "site.py", line 132, in main
File "site.py", line 109, in run_entry_point
File "site-packages\calibre\utils\ipc\worker.py", line 186, in main
File "site-packages\calibre\gui2\convert\gui_conversion.py", line 31, in gui_convert_override
File "site-packages\calibre\gui2\convert\gui_conversion.py", line 25, in gui_convert
File "site-packages\calibre\ebooks\conversion\plumber.py", line 1049, in run
File "site-packages\calibre\ebooks\oeb\transforms\structure.p y", line 33, in __call__
File "site-packages\calibre\ebooks\oeb\transforms\structure.p y", line 124, in detect_chapters
TypeError: 'bool' object is not iterable

This portable calibre, let's call it calibre1, has a few extra plugins installed, and a custom column (of type 'date').

I downloaded and expanded another portable calibre, let's call it calibre2, added the same pdf file to the database, and successfully converted that pdf file to mobi.

At this point I pointed calibre2 to use calibre1's database and attempted to convert another pdf file. This time also calibre2 failed converting the file and output exactly the same error log.

So I'm thinking that calibre1's database is somehow corrupted to the point that no file can be converted to another format.

Questions/Help Req:
1) How can I fix calibre1 so that I can successfully convert ebooks?
2) If fixing calibre1 entails rebuilding the whole ebook database, what's the best/quickest way to do it? Will I lose any metadata in doing so? Will the library folder structure change?
3) Where does calibre keep all those .py files that are referenced in the error log, like site.py, etc. I searched through calibre1's folder but couldn''t find any of them.

Thanks in advance