conversion error

[happyreader26]

I recently developed a problem trying to convert my ebooks to other formats. I'm using 0.6.45 on a Windows Vista platform. The problem doesn't seem to be with any particular input or output format.

I get an basic error message that the conversion failed. I was afraid that I had incorrectly set one of my Preferences, but have tried and tried and can't figure out which one. Here are the conversion error "details." Does anyone have any suggestions where to start looking? Thanks in advance

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

Convert book 1 of 1
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:\\users\\kab\\appdata\\local\\temp\\calibre_0.6 .45_g5zuyw.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': None,
'header_regex': None,
'input_encoding': None,
'input_profile': <calibre.customize.profiles.InputProfile object at 0x04FC5070>,
'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 0x04FC5390>,
'page_breaks_before': u'/',
'prefer_metadata_cover': False,
'preprocess_html': False,
'pretty_print': True,
'pubdate': None,
'publisher': None,
'rating': None,
'read_metadata_from_opf': 'c:\\users\\kab\\appdata\\local\\temp\\calibre_0.6 .45_8qmlct.opf',
'remove_first_image': False,
'remove_footer': True,
'remove_header': True,
'remove_paragraph_spacing': False,
'remove_paragraph_spacing_indent_size': 1.5,
'series': None,
'series_index': None,
'tags': None,
'timestamp': None,
'title': None,
'title_sort': None,
'toc_filter': None,
'toc_threshold': 6,
'use_auto_toc': False,
'verbose': 2}
InputFormatPlugin: LIT Input running
on C:\Users\KAB\Documents\Calibre E-books\Brooke_ Leah\Dakota Springs (2849)\Dakota Springs - Brooke_ Leah.lit
Parsing all content...
Parsing ~cov0004.htm ...
Failed to parse content in ~cov0004.htm
Traceback (most recent call last):
File "site-packages\calibre\ebooks\oeb\reader.py", line 159, in _manifest_prune_invalid
File "site-packages\calibre\ebooks\oeb\base.py", line 1033, in fget
File "site-packages\calibre\ebooks\oeb\base.py", line 788, in _parse_xhtml
File "site-packages\calibre\ebooks\conversion\preprocess.py", line 234, in __call__
File "re.py", line 190, in compile
File "re.py", line 241, in _compile
TypeError: first argument must be string or compiled pattern

Parsing 1606017314-Dakota-Springs-Brooke.htm ...
Failed to parse content in 1606017314-Dakota-Springs-Brooke.htm
Traceback (most recent call last):
File "site-packages\calibre\ebooks\oeb\reader.py", line 159, in _manifest_prune_invalid
File "site-packages\calibre\ebooks\oeb\base.py", line 1033, in fget
File "site-packages\calibre\ebooks\oeb\base.py", line 788, in _parse_xhtml
File "site-packages\calibre\ebooks\conversion\preprocess.py", line 234, in __call__
File "re.py", line 190, in compile
File "re.py", line 241, in _compile
TypeError: first argument must be string or compiled pattern

Spine item 'RW_1606017314-Dakota-Springs-Brooke' not found
Python function terminated unexpectedly
Spine is empty (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 99, in main
File "site-packages\calibre\gui2\convert\gui_conversion.py", line 24, in gui_convert
File "site-packages\calibre\ebooks\conversion\plumber.py", line 787, in run
File "site-packages\calibre\customize\conversion.py", line 211, in __call__
File "site-packages\calibre\ebooks\lit\input.py", line 22, in convert
File "site-packages\calibre\ebooks\conversion\plumber.py", line 923, in create_oebbook
File "site-packages\calibre\ebooks\oeb\reader.py", line 72, in __call__
File "site-packages\calibre\ebooks\oeb\reader.py", line 592, in _all_from_opf
File "site-packages\calibre\ebooks\oeb\reader.py", line 289, in _spine_from_opf
calibre.ebooks.oeb.base.OEBError: Spine is empty

[kovidgoyal]

This will be because you have changed the header and footer removal regular expressions to blanks. Set them instead to

^$

or uncheck the remove header and remove footer options