[JBD]

Suddenly Calibre stopped working when I try to convert html files to epubs, even old ones that have successfully converted before.

I have already uninstalled and reinstalled. I've tried deleting the metadata.db file, and have even created a new library. Nothing changes.

What does work is other conversions (e.g. existing epubs to mobi, rtf to epub...)

I'm using Win7. Can anyone help me get Calibre working again?

The error message I get is this:

Spoiler:

calibre, version 0.8.55
ERROR: Conversion Error: <b>Failed</b>: Convert book 1 of 1 (Eyes of a Child)

Convert book 1 of 1 (Eyes of a Child)
Processing archive...
Resolved conversion options
calibre version: 0.8.55
{'asciiize': False,
'author_sort': None,
'authors': None,
'base_font_size': 0.0,
'book_producer': None,
'breadth_first': False,
'change_justification': u'original',
'chapter': u'//h:h2[re:test(., "*", "i")]',
'chapter_mark': u'pagebreak',
'comments': None,
'cover': u'C:\\Users\\Jude\\AppData\\Local\\Temp\\calibre_0 .8.55_tmp__f4f5e\\isicsu.jpeg',
'debug_pipeline': None,
'dehyphenate': True,
'delete_blank_paragraphs': True,
'disable_font_rescaling': False,
'dont_package': False,
'dont_split_on_page_breaks': False,
'duplicate_links_in_toc': False,
'enable_heuristics': False,
'epub_flatten': 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 0x03F8C7D0>,
'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:h2[re:test(., "*", "i")]',
'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_levels': 5,
'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.iPadOutput object at 0x03F8CA70>,
'page_breaks_before': u'//h:h2',
'prefer_metadata_cover': False,
'preserve_cover_aspect_ratio': True,
'pretty_print': True,
'pubdate': None,
'publisher': None,
'rating': None,
'read_metadata_from_opf': u'C:\\Users\\Jude\\AppData\\Local\\Temp\\calibre_0 .8.55_tmp__f4f5e\\jr5evp.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,
'tags': None,
'timestamp': None,
'title': None,
'title_sort': None,
'toc_filter': None,
'toc_threshold': 2,
'unsmarten_punctuation': False,
'unwrap_lines': True,
'use_auto_toc': False,
'verbose': 2}
InputFormatPlugin: HTML Input running
on C:\Users\Jude\AppData\Local\Temp\calibre_0.8.55_tm p__f4f5e\62g7si_plumber_archive\content.opf
Parsing all content...
Manifest item 'toc.ncx' not found
Parsing eyesofac_epub.html ...
Generating default TOC from spine...
Merging user specified metadata...
Detecting structure...
Python function terminated unexpectedly
nothing to repeat (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 191, 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 1017, 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 88, in detect_chapters
File "xpath.pxi", line 469, in lxml.etree.XPath.__call__ (src/lxml/lxml.etree.c:115236)
File "xpath.pxi", line 238, in lxml.etree._XPathEvaluatorBase._handle_result (src/lxml/lxml.etree.c:113030)
File "lxml.etree.pyx", line 282, in lxml.etree._ExceptionContext._raise_if_stored (src/lxml/lxml.etree.c:7972)
File "extensions.pxi", line 755, in lxml.etree._extension_function_call (src/lxml/lxml.etree.c:110601)
File "extensions.pxi", line 424, in lxml.etree._ExsltRegExp.test (src/lxml/lxml.etree.c:107085)
File "extensions.pxi", line 417, in lxml.etree._ExsltRegExp._compile (src/lxml/lxml.etree.c:106913)
File "re.py", line 190, in compile
File "re.py", line 242, in _compile
sre_constants.error: nothing to repeat