I recently began using Calibre 0.7.20 to convert PDF's to Mobi files to increase readability. Most of my files worked, but a few did not. Calibre simply "failed" to covert them, and I tried them again and again. Is there a way to jailbreak them so I can convert? (there are no copyright issues, the authors of each were from the 19th Century and I got them for free on the internet from academic institutions, thus avoiding all intellectual property restrictions). Below is the error message:
ERROR: Conversion Error: <b>Failed</b>: Convert book 1 of 1 (Principles of Economics)
Convert book 1 of 1 (Principles of Economics)
Resolved conversion options
calibre version: 0.7.20
{'asciiize': False,
'author_sort': None,
'authors': None,
'base_font_size': 11.0,
'book_producer': None,
'change_justification': u'justify',
'chapter': u"//*[((name()='h1' or name()='h2') and re:test(., 'chapter|book|section|part|prologue|epilogue\\s+', 'i')) or @class = 'chapter']",
'chapter_mark': u'pagebreak',
'comments': None,
'cover': 'c:\\docume~1\\user\\locals~1\\temp\\calibre_0.7.2 0_tmp_wgnvrb\\calibre_0.7.20_kyhh5a.jpeg',
'debug_pipeline': None,
'disable_font_rescaling': False,
'dont_compress': False,
'extra_css': None,
'font_size_mapping': None,
'footer_regex': u'(?i)(?<=<hr>)((\\s*<a name=\\d+></a>((<img.+?>)*<br>\\s*)?\\d+<br>\\s*.*?\\s*)|(\\s* <a name=\\d+></a>((<img.+?>)*<br>\\s*)?.*?<br>\\s*\\d+))(?=<br>)' ,
'header_regex': u'(?i)(?<=<hr>)((\\s*<a name=\\d+></a>((<img.+?>)*<br>\\s*)?\\d+<br>\\s*.*?\\s*)|(\\s* <a name=\\d+></a>((<img.+?>)*<br>\\s*)?.*?<br>\\s*\\d+))(?=<br>)' ,
'html_unwrap_factor': 0.40000000000000002,
'input_encoding': None,
'input_profile': <calibre.customize.profiles.InputProfile object at 0x03C17730>,
'insert_blank_line': False,
'insert_metadata': False,
'isbn': None,
'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,
'max_toc_links': 50,
'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 0x03C17A10>,
'page_breaks_before': u"//*[name()='h1' or name()='h2']",
'personal_doc': u'[PDOC]',
'prefer_author_sort': True,
'prefer_metadata_cover': True,
'preprocess_html': False,
'pretty_print': False,
'pubdate': None,
'publisher': None,
'rating': None,
'read_metadata_from_opf': 'c:\\docume~1\\user\\locals~1\\temp\\calibre_0.7.2 0_tmp_wgnvrb\\calibre_0.7.20_nel9ak.opf',
'remove_first_image': False,
'remove_footer': False,
'remove_header': False,
'remove_paragraph_spacing': False,
'remove_paragraph_spacing_indent_size': 1.5,
'rescale_images': False,
'series': None,
'series_index': None,
'smarten_punctuation': False,
'tags': None,
'timestamp': None,
'title': None,
'title_sort': None,
'toc_filter': None,
'toc_threshold': 6,
'toc_title': None,
'unwrap_factor': 0.45000000000000001,
'use_auto_toc': False,
'verbose': 2}
InputFormatPlugin: PDF Input running
on C:\Documents and Settings\User\My Documents\Kindle PDF's\Carl Menger\Principles of Economics (9)\Principles of Economics - Carl Menger.pdf
Converting file to html...
pdftohtml log:
Retrieving document metadata...
Generating manifest...
Rendering manifest...
Parsing all content...
Parsing index.html ...
Failed to parse content in index.html
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 1060, in fget
File "site-packages\calibre\ebooks\oeb\base.py", line 789, in _parse_xhtml
File "site-packages\calibre\ebooks\conversion\preprocess.py", line 431, in __call__
File "site-packages\calibre\ebooks\conversion\preprocess.py", line 152, in __call__
File "site-packages\calibre\ebooks\conversion\preprocess.py", line 133, in dehyphenate
File "re.py", line 190, in compile
File "re.py", line 245, in _compile
error: unbalanced parenthesis
Spine item 'id1' 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 841, in run
File "site-packages\calibre\ebooks\conversion\plumber.py", line 968, in create_oebbook
File "site-packages\calibre\ebooks\oeb\reader.py", line 72, in __call__
File "site-packages\calibre\ebooks\oeb\reader.py", line 594, 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