Callibre error when converting (pdb to epub)

[cistehovado]

Hello I got following error on many books in my collection,
do someone know how to succesfully convert my books ?

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ERROR: Conversion Error
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<b>Failed</b>: Convert book 1 of 1 (Burroughs_Edgar_Rice-Tarzan-09-Tarzan_a_zlaty_lev)
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Convert book 1 of 1 (Burroughs_Edgar_Rice-Tarzan-09-Tarzan_a_zlaty_lev)
Processing archive...
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': None,
'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': 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': u'cp1250',
'input_profile': <calibre.customize.profiles.InputProfile object at 0x02979230>,
'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.OutputProfile object at 0x02979370>,
'page_breaks_before': u'/',
'prefer_metadata_cover': False,
'preprocess_html': False,
'pretty_print': True,
'print_formatted_paras': False,
'publisher': None,
'rating': None,
'read_metadata_from_opf': 'c:\\docume~1\\admini~1\\locals~1\\temp\\calibre_0 .6.29_gw6yog.opf',
'remove_first_image': False,
'remove_footer': False,
'remove_header': False,
'remove_paragraph_spacing': False,
'remove_paragraph_spacing_indent_size': 1.5,
'series': None,
'series_index': None,
'single_line_paras': False,
'tags': None,
'title': None,
'title_sort': None,
'toc_filter': None,
'toc_threshold': 6,
'use_auto_toc': False,
'verbose': 2}
InputFormatPlugin: PDB Input running
on c:\docume~1\admini~1\locals~1\temp\calibre_0.6.29_ ly2z_w_plumber\Burroughs_E_R-Tarzan-09.pdb
Detected ebook format as: PalmDOC with identity: TEXtREAd
Decompressing text...
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Converting text to OEB...
Parsing all content...
Parsing index.html ...
Forcing index.html into XHTML namespace
Generating default TOC from spine...
Merging user specified metadata...
Detecting structure...
Auto generated TOC with 0 entries.
Flattening CSS and remapping font sizes...
Source base font size is 12.00000pt
Cleaning up manifest...
Trimming unused files from manifest...
Parsing stylesheet.css ...
Creating EPUB Output...
Looking for large trees in index.html...
Found large tree #0
Splitting...
Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[2]
Committed sub-tree #1 (0 KB)
Split tree still too large: 267 KB
Splitting...
Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[2]
Committed sub-tree #2 (0 KB)
Split tree still too large: 267 KB
Splitting...
Python function terminated unexpectedly
'NoneType' object has no attribute 'tag' (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 843, in run
File "site-packages\calibre\ebooks\epub\output.py", line 162, in convert
File "site-packages\calibre\ebooks\oeb\transforms\split.py", line 56, in __call__
File "site-packages\calibre\ebooks\oeb\transforms\split.py", line 66, in split_item
File "site-packages\calibre\ebooks\oeb\transforms\split.py", line 188, in __init__
File "site-packages\calibre\ebooks\oeb\transforms\split.py", line 402, in split_to_size
File "site-packages\calibre\ebooks\oeb\transforms\split.py", line 402, in split_to_size
File "site-packages\calibre\ebooks\oeb\transforms\split.py", line 384, in split_to_size
AttributeError: 'NoneType' object has no attribute 'tag'
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[cistehovado]

anyone who can help ?

[user_none]

Convert it again with the "Treat each line as a paragraph" option in the PDB input settings.