[seagull]

I'm trying to convert an .epub file to .mobi and get this error:

ERROR: Conversion Error: <b>Failed</b>: Convert book 1 of 1 (Unseen Academicals)

Convert book 1 of 1 (Unseen Academicals)
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:\\docume~1\\calvin\\locals~1\\temp\\calibre_0.6 .31_dl2vew.jpeg',
'debug_pipeline': None,
'disable_font_rescaling': False,
'dont_compress': False,
'dont_justify': 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>)' ,
'input_encoding': None,
'input_profile': <calibre.customize.profiles.InputProfile object at 0x02852D30>,
'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_inline_navbars': True,
'no_inline_toc': True,
'output_profile': <calibre.customize.profiles.KindleOutput object at 0x0285A050>,
'page_breaks_before': u'/',
'prefer_author_sort': True,
'prefer_metadata_cover': False,
'preprocess_html': False,
'pretty_print': False,
'publisher': None,
'rating': None,
'read_metadata_from_opf': 'c:\\docume~1\\calvin\\locals~1\\temp\\calibre_0.6 .31_ngrb6x.opf',
'remove_first_image': True,
'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,
'tags': None,
'title': None,
'title_sort': None,
'toc_filter': None,
'toc_threshold': 6,
'toc_title': None,
'use_auto_toc': False,
'verbose': 2}
InputFormatPlugin: EPUB Input running
on C:\Documents and Settings\Calvin\Calibre Library\Pratchett_ Terry\Unseen Academicals (5)\Unseen Academicals - Pratchett_ Terry.epub
Found HTML cover OEBPS/unseenacademicals_cov.html
Parsing all content...
Parsing OEBPS/footnote13.html ...
Parsing OEBPS/footnote4.html ...
Parsing OEBPS/footnote6.html ...
Parsing OEBPS/footnote8.html ...
Parsing OEBPS/footnote15.html ...
Parsing OEBPS/footnote27.html ...
Parsing OEBPS/unseenacademicals_con.html ...
Parsing OEBPS/footnote11.html ...
Parsing OEBPS/unseenacademicals.css ...
Property: Invalid value for "CSS Level 2.1" property: sup [1221:2: vertical-align]
Property: Invalid value for "CSS Level 2.1" property: sup [1985:2: vertical-align]
Parsing OEBPS/unseenacademicals_cov.html ...
Parsing OEBPS/unseenacademicals_adc01.html ...
Parsing OEBPS/unseenacademicals_tp01.html ...
Parsing OEBPS/unseenacademicals_ded01.html ...
Parsing OEBPS/unseenacademicals_ch02.html ...
Initial parse failed:
Traceback (most recent call last):
File "site-packages\calibre\ebooks\oeb\base.py", line 803, in first_pass
File "lxml.etree.pyx", line 2538, in lxml.etree.fromstring (src/lxml/lxml.etree.c:48266)
File "parser.pxi", line 1536, in lxml.etree._parseMemoryDocument (src/lxml/lxml.etree.c:71653)
File "parser.pxi", line 1408, in lxml.etree._parseDoc (src/lxml/lxml.etree.c:70449)
File "parser.pxi", line 898, in lxml.etree._BaseParser._parseUnicodeDoc (src/lxml/lxml.etree.c:67144)
File "parser.pxi", line 539, in lxml.etree._ParserContext._handleParseResultDoc (src/lxml/lxml.etree.c:63820)
File "parser.pxi", line 625, in lxml.etree._handleParseResult (src/lxml/lxml.etree.c:64741)
File "parser.pxi", line 565, in lxml.etree._raiseParseError (src/lxml/lxml.etree.c:64084)
XMLSyntaxError: Unescaped '<' not allowed in attributes values, line 1196, column 41

Parsing file 'OEBPS/unseenacademicals_ch02.html' as HTML
Forcing OEBPS/unseenacademicals_ch02.html into XHTML namespace
Stripping comments and meta tags from OEBPS/unseenacademicals_ch02.html
Failed to parse content in OEBPS/unseenacademicals_ch02.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 1014, in fget
File "site-packages\calibre\ebooks\oeb\base.py", line 871, in _parse_xhtml
File "lxml.etree.pyx", line 2538, in lxml.etree.fromstring (src/lxml/lxml.etree.c:48266)
File "parser.pxi", line 1536, in lxml.etree._parseMemoryDocument (src/lxml/lxml.etree.c:71653)
File "parser.pxi", line 1408, in lxml.etree._parseDoc (src/lxml/lxml.etree.c:70449)
File "parser.pxi", line 898, in lxml.etree._BaseParser._parseUnicodeDoc (src/lxml/lxml.etree.c:67144)
File "parser.pxi", line 539, in lxml.etree._ParserContext._handleParseResultDoc (src/lxml/lxml.etree.c:63820)
File "parser.pxi", line 625, in lxml.etree._handleParseResult (src/lxml/lxml.etree.c:64741)
File "parser.pxi", line 565, in lxml.etree._raiseParseError (src/lxml/lxml.etree.c:64084)
XMLSyntaxError: error parsing attribute name, line 1253, column 29

Parsing OEBPS/footnote12.html ...
Parsing OEBPS/unseenacademicals_ch03.html ...
Parsing OEBPS/unseenacademicals_ch04.html ...
Parsing OEBPS/unseenacademicals_ata01.html ...
Parsing OEBPS/footnote14.html ...
Parsing OEBPS/unseenacademicals_cre01.html ...
Parsing OEBPS/unseenacademicals_cop01.html ...
Parsing OEBPS/unseenacademicals_atp01.html ...
Parsing OEBPS/footnote17.html ...
Parsing OEBPS/footnote19.html ...
Parsing OEBPS/footnote20.html ...
Parsing OEBPS/footnote22.html ...
Parsing OEBPS/footnote24.html ...
Parsing OEBPS/footnote26.html ...
Parsing OEBPS/footnote3.html ...
Parsing OEBPS/footnote5.html ...
Parsing OEBPS/footnote7.html ...
Parsing OEBPS/footnote9.html ...
Parsing OEBPS/footnote10.html ...
Parsing OEBPS/unseenacademicals_ch01.html ...
Parsing OEBPS/footnote1.html ...
Parsing OEBPS/footnote16.html ...
Parsing OEBPS/footnote18.html ...
Parsing OEBPS/footnote2.html ...
Parsing OEBPS/footnote21.html ...
Parsing OEBPS/footnote23.html ...
Parsing OEBPS/footnote25.html ...
Referenced file 'OEBPS/unseenacademicals_ch02.html' not in manifest
Parsing OEBPS/unseenacademicals_ch02.html ...
Initial parse failed:
Traceback (most recent call last):
File "site-packages\calibre\ebooks\oeb\base.py", line 803, in first_pass
File "lxml.etree.pyx", line 2538, in lxml.etree.fromstring (src/lxml/lxml.etree.c:48266)
File "parser.pxi", line 1536, in lxml.etree._parseMemoryDocument (src/lxml/lxml.etree.c:71653)
File "parser.pxi", line 1408, in lxml.etree._parseDoc (src/lxml/lxml.etree.c:70449)
File "parser.pxi", line 898, in lxml.etree._BaseParser._parseUnicodeDoc (src/lxml/lxml.etree.c:67144)
File "parser.pxi", line 539, in lxml.etree._ParserContext._handleParseResultDoc (src/lxml/lxml.etree.c:63820)
File "parser.pxi", line 625, in lxml.etree._handleParseResult (src/lxml/lxml.etree.c:64741)
File "parser.pxi", line 565, in lxml.etree._raiseParseError (src/lxml/lxml.etree.c:64084)
XMLSyntaxError: Unescaped '<' not allowed in attributes values, line 1196, column 41

Parsing file 'OEBPS/unseenacademicals_ch02.html' as HTML
Forcing OEBPS/unseenacademicals_ch02.html into XHTML namespace
Stripping comments and meta tags from OEBPS/unseenacademicals_ch02.html
Python function terminated unexpectedly
error parsing attribute name, line 1253, column 29 (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 90, in main
File "site-packages\calibre\gui2\convert\gui_conversion.py", line 21, in gui_convert
File "site-packages\calibre\ebooks\conversion\plumber.py", line 745, in run
File "site-packages\calibre\ebooks\conversion\plumber.py", line 866, in create_oebbook
File "site-packages\calibre\ebooks\oeb\reader.py", line 72, in __call__
File "site-packages\calibre\ebooks\oeb\reader.py", line 588, in _all_from_opf
File "site-packages\calibre\ebooks\oeb\reader.py", line 243, in _manifest_from_opf
File "site-packages\calibre\ebooks\oeb\reader.py", line 176, in _manifest_add_missing
File "site-packages\calibre\ebooks\oeb\base.py", line 1014, in fget
File "site-packages\calibre\ebooks\oeb\base.py", line 871, in _parse_xhtml
File "lxml.etree.pyx", line 2538, in lxml.etree.fromstring (src/lxml/lxml.etree.c:48266)
File "parser.pxi", line 1536, in lxml.etree._parseMemoryDocument (src/lxml/lxml.etree.c:71653)
File "parser.pxi", line 1408, in lxml.etree._parseDoc (src/lxml/lxml.etree.c:70449)
File "parser.pxi", line 898, in lxml.etree._BaseParser._parseUnicodeDoc (src/lxml/lxml.etree.c:67144)
File "parser.pxi", line 539, in lxml.etree._ParserContext._handleParseResultDoc (src/lxml/lxml.etree.c:63820)
File "parser.pxi", line 625, in lxml.etree._handleParseResult (src/lxml/lxml.etree.c:64741)
File "parser.pxi", line 565, in lxml.etree._raiseParseError (src/lxml/lxml.etree.c:64084)
lxml.etree.XMLSyntaxError: error parsing attribute name, line 1253, column 29

Any ideas?