[Mike the best]

Originally Posted by PeterT

No one here is clairvoyant. Could you maybe help us by describing what fails, posting error messages and logs?

I have installed the KePub Metadata Reader, the KePub Metadata Write and the KePub Outputs plug-ins. Then I try to convert the books and an error message appears. It's attached below.
Also this is the text that shows at the message: calibre, version 2.42.0 (win32, isfrozen: True)
Conversion Error: Failed: Convert book 1 of 1 (Unforgiven)

Spoiler:

Convert book 1 of 1 (Unforgiven)
C:\Program Files (x86)\Calibre2\pylib.zip\dateutil\parser.py:339: UnicodeWarning: Unicode equal comparison failed to convert both arguments to Unicode - interpreting them as being unequal
Resolved conversion options
calibre version: 2.42.0
{'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)\\s+)|((prolog|pr ologue|epilogue)(\\s+|$))', 'i')) or @class = 'chapter']",
'chapter_mark': u'pagebreak',
'comments': None,
'cover': u'C:\\Users\\C376~1\\AppData\\Local\\Temp\\calibre _cn6obl\\q6dwod.jpeg',
'debug_pipeline': None,
'dehyphenate': True,
'delete_blank_paragraphs': True,
'disable_font_rescaling': True,
'dont_split_on_page_breaks': False,
'duplicate_links_in_toc': False,
'embed_all_fonts': False,
'embed_font_family': None,
'enable_heuristics': False,
'epub_flatten': False,
'epub_inline_toc': False,
'epub_toc_at_end': False,
'expand_css': False,
'extra_css': None,
'extract_to': None,
'filter_css': u'',
'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 0x04E6BF70>,
'insert_blank_line': False,
'insert_blank_line_size': 0.5,
'insert_metadata': False,
'isbn': None,
'italicize_common_cases': True,
'keep_ligatures': False,
'kepub_clean_markup': True,
'kepub_disable_hyphenation': False,
'kepub_hyphenate': True,
'kepub_replace_lang': True,
'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,
'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 0x04E713B0>,
'page_breaks_before': u"//*[name()='h1' or name()='h2']",
'prefer_metadata_cover': False,
'preserve_cover_aspect_ratio': False,
'pretty_print': True,
'pubdate': None,
'publisher': None,
'rating': None,
'read_metadata_from_opf': u'C:\\Users\\C376~1\\AppData\\Local\\Temp\\calibre _cn6obl\\hznso8.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,
'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_lines': True,
'use_auto_toc': False,
'verbose': 2}
InputFormatPlugin: MOBI Input running
on C:\Users\C376~1\AppData\Local\Temp\calibre_cn6obl\ x3rsaw.mobi
Found KF8 MOBI of type 'joint'
Extracting text...
KF8 has no metadata Table of Contents
Parsing all content...
Parsing styles/0001.css ...
Parsing text/part0000.html ...
Forcing text/part0000.html into XHTML namespace
Referenced file u'text/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX' not found
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...
Found 2061 items of level: p_2
Found 1 items of level: div_1
Found 33 items of level: div_3
p_2 left margin stats: Counter({u'0%': 2060, u'41.67%': 1})
p_2 right margin stats: Counter({u'0%': 2061})
Removing level p_2 left margin of: 0%
Removing level p_2 right margin of: 0%
div_1 left margin stats: Counter({u'': 1})
div_1 right margin stats: Counter({u'': 1})
div_3 left margin stats: Counter({u'': 33})
div_3 right margin stats: Counter({u'': 33})
Cleaning up manifest...
Trimming unused files from manifest...
Trimming u'images/00003.jpeg' from manifest
Creating KePub Output...
Rescaling image from 769x1228 to 429x686 cover.jpeg
Splitting markup on page breaks and flow limits, if any...
Splitting on page-break at id=calibre_pb_0
Splitting on page-break at id=calibre_pb_1
Adjusted split point to ancestor
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Looking for large trees in text/part0000.html...
No large trees found
Split into 35 parts
This EPUB file has no Table of Contents. Creating a default TOC
Copying file 'C:\Users\C376~1\AppData\Local\Temp\calibre_cn6obl \vjus3y_KePubOutputPluginInfo' to 'C:\Users\C376~1\AppData\Local\Temp\calibre_cn6obl \ttxl9k_epub_container' as 'plugininfo.kte'
{'clean_markup': True, 'hyphenate': True, 'no-hyphens': False, 'smarten_punctuation': False, 'extended_kepub_features': True, 'replace_lang': True}
KoboTouchExtended:common:modify_epub:Found cover image ID 'cover'
KoboTouchExtended:common:modify_epub:Setting cover-image property
Forcing cleanup for file text/part0000_split_000.html
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Forcing cleanup for file titlepage.xhtml
Cleaning markup for file text/part0000_split_000.html
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Cleaning markup for file titlepage.xhtml
Copying file 'C:\Users\C376~1\AppData\Local\Temp\calibre_cn6obl \kepub_lvcnny_hyphenate' to 'C:\Users\C376~1\AppData\Local\Temp\calibre_cn6obl \ttxl9k_epub_container' as 'kte-css/hyphenation.css'
Adding reference to kte-css/hyphenation.css to file text/part0000_split_000.html
C:\Program Files (x86)\Calibre2\pylib.zip\ntpath.py:532: UnicodeWarning: Unicode unequal comparison failed to convert both arguments to Unicode - interpreting them as being unequal
Python function terminated unexpectedly
All strings must be XML compatible: Unicode or ASCII, no NULL bytes or control characters (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 193, 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 1207, in run
File "calibre_plugins.kepubout.conversion.kepub_output" , line 100, in convert
File "calibre_plugins.kepubout.common", line 82, in modify_epub
File "calibre_plugins.kepubout.container", line 158, in add_content_file_reference
File "lxml.etree.pyx", line 1445, in lxml.etree._Element.makeelement (src\lxml\lxml.etree.c:49848)
File "apihelpers.pxi", line 133, in lxml.etree._makeElement (src\lxml\lxml.etree.c:14869)
File "apihelpers.pxi", line 121, in lxml.etree._makeElement (src\lxml\lxml.etree.c:14748)
File "apihelpers.pxi", line 268, in lxml.etree._initNodeAttributes (src\lxml\lxml.etree.c:16296)
File "apihelpers.pxi", line 290, in lxml.etree._addAttributeToNode (src\lxml\lxml.etree.c:16701)
File "apihelpers.pxi", line 1395, in lxml.etree._utf8 (src\lxml\lxml.etree.c:26485)
ValueError: All strings must be XML compatible: Unicode or ASCII, no NULL bytes or control characters