EPUB -> PDF fail: Invalid Page Number: 0 (Error Code:1)

Hi,

I try to convert a epub which contains mainly pictures to a pdf document (without loss).

But I get the following error message:

[CODE]
calibre, version 4.4.0 (win32, embedded-python: True)
Konvertierungsfehler: Fehlgeschlagen: Buch 1 von 1 (Sachen suchen) konvertieren

Buch 1 von 1 (Sachen suchen) konvertieren
Conversion options changed from defaults:
pdf_serif_family: u'Times New Roman'
cover: u'C:\\Users\\ABC~1\\AppData\\Local\\Temp\\calibre_ e2cv0m\\z8cxhg.jpeg'
read_metadata_from_opf: u'C:\\Users\\ABC~1\\AppData\\Local\\Temp\\calibre_ e2cv0m\\ttdapq.opf'
pdf_mono_family: u'Courier New'
output_profile: u'tablet'
paper_size: u'a4'
verbose: 2
Resolved conversion options
calibre version: 4.4.0
{'asciiize': False,
'author_sort': None,
'authors': None,
'base_font_size': 0.0,
'book_producer': None,
'change_justification': u'original',
'chapter': u"//*[((name()='h1' or name()='h2') and re:test(., '\\s*((chapter|book|section|part)\\s+)|((prolog|pr ologue|epilogue)(\\s+|$))', 'i')) or @class = 'chapter']",
'chapter_mark': u'pagebreak',
'comments': None,
'cover': u'C:\\Users\\ABC~1\\AppData\\Local\\Temp\\calibre_ e2cv0m\\z8cxhg.jpeg',
'custom_size': None,
'debug_pipeline': None,
'dehyphenate': True,
'delete_blank_paragraphs': True,
'disable_font_rescaling': False,
'duplicate_links_in_toc': False,
'embed_all_fonts': False,
'embed_font_family': None,
'enable_heuristics': False,
'expand_css': False,
'extra_css': None,
'filter_css': u'',
'fix_indents': True,
'font_size_mapping': None,
'format_scene_breaks': True,
'html_unwrap_factor': 0.4,
'input_encoding': None,
'input_profile': <calibre.customize.profiles.InputProfile object at 0x000002E0178D6208>,
'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': 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,
'markup_chapter_headings': True,
'max_toc_links': 50,
'minimum_line_height': 120.0,
'no_chapters_in_toc': False,
'no_inline_navbars': False,
'output_profile': <calibre.customize.profiles.TabletOutput object at 0x000002E0178E7688>,
'page_breaks_before': u'/',
'paper_size': u'a4',
'pdf_add_toc': False,
'pdf_default_font_size': 20,
'pdf_footer_template': None,
'pdf_header_template': None,
'pdf_hyphenate': False,
'pdf_mark_links': False,
'pdf_mono_family': u'Courier New',
'pdf_mono_font_size': 16,
'pdf_page_margin_bottom': 72.0,
'pdf_page_margin_left': 72.0,
'pdf_page_margin_right': 72.0,
'pdf_page_margin_top': 72.0,
'pdf_page_number_map': None,
'pdf_page_numbers': False,
'pdf_sans_family': u'Helvetica',
'pdf_serif_family': u'Times New Roman',
'pdf_standard_font': u'serif',
'pdf_use_document_margins': False,
'prefer_metadata_cover': False,
'preserve_cover_aspect_ratio': False,
'pretty_print': False,
'pubdate': None,
'publisher': None,
'rating': None,
'read_metadata_from_opf': u'C:\\Users\\ABC~1\\AppData\\Local\\Temp\\calibre_ e2cv0m\\ttdapq.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,
'start_reading_at': None,
'subset_embedded_fonts': False,
'tags': None,
'timestamp': None,
'title': None,
'title_sort': None,
'toc_filter': None,
'toc_threshold': 6,
'toc_title': None,
'transform_css_rules': '[]',
'uncompressed_pdf': False,
'unit': u'inch',
'unsmarten_punctuation': False,
'unwrap_lines': True,
'use_auto_toc': False,
'use_profile_size': False,
'verbose': 2}
InputFormatPlugin: EPUB Input running
on C:\Users\ABC~1\AppData\Local\Temp\calibre_e2cv0m\h _jzyl.epub
Parsing all content...
Parsing OEBPS/03_Sachen_suchen_-_komplett-10.xhtml ...
Parsing OEBPS/03_Sachen_suchen_-_komplett-13.xhtml ...
Parsing OEBPS/03_Sachen_suchen_-_komplett-11.xhtml ...
Parsing OEBPS/03_Sachen_suchen_-_komplett-5.xhtml ...
Parsing OEBPS/03_Sachen_suchen_-_komplett-12.xhtml ...
Parsing OEBPS/03_Sachen_suchen_-_komplett-8.xhtml ...
Parsing OEBPS/03_Sachen_suchen_-_komplett-3.xhtml ...
Parsing OEBPS/03_Sachen_suchen_-_komplett-1.xhtml ...
Parsing OEBPS/toc.xhtml ...
Parsing OEBPS/03_Sachen_suchen_-_komplett-7.xhtml ...
Parsing OEBPS/css/idGeneratedStyles.css ...
Parsing OEBPS/03_Sachen_suchen_-_komplett-2.xhtml ...
Parsing OEBPS/03_Sachen_suchen_-_komplett-4.xhtml ...
Parsing OEBPS/03_Sachen_suchen_-_komplett-6.xhtml ...
Parsing OEBPS/03_Sachen_suchen_-_komplett-9.xhtml ...
Reading TOC from NCX...
Merging user specified metadata...
Detecting structure...
Flattening CSS and remapping font sizes...
Source base font size is 12.00000pt
Removing fake margins...
Found 101 items of level: div_1
Found 8 items of level: p_3
Found 1 items of level: div_2
Ignoring level p_3
div_1 left margin stats: Counter({u'0': 1})
div_1 right margin stats: Counter({u'0': 1})
div_2 left margin stats: Counter({u'0': 1})
div_2 right margin stats: Counter({u'0': 1})
Cleaning up manifest...
Trimming unused files from manifest...
Trimming u'page_styles.css' from manifest
Trimming u'OEBPS/toc.xhtml' from manifest
Creating PDF Output...
Converting input as a text based book...
Python function terminated unexpectedly
Invalid page number: 0 (Error Code: 1)
Traceback (most recent call last):
File "site.py", line 114, in main
File "site.py", line 88, in run_entry_point
File "site-packages\calibre\utils\ipc\worker.py", line 208, in main
File "site-packages\calibre\gui2\convert\gui_conversion.py", line 43, in gui_convert_override
File "site-packages\calibre\gui2\convert\gui_conversion.py", line 28, in gui_convert
File "site-packages\calibre\ebooks\conversion\plumber.py", line 1275, in run
File "site-packages\calibre\ebooks\conversion\plugins\pdf_out put.py", line 176, in convert
File "site-packages\calibre\ebooks\conversion\plugins\pdf_out put.py", line 243, in convert_text
File "site-packages\calibre\ebooks\pdf\html_writer.py", line 1194, in convert
File "site-packages\calibre\ebooks\pdf\html_writer.py", line 592, in add_toc
File "site-packages\calibre\ebooks\pdf\html_writer.py", line 569, in create
ValueError: Invalid page number: 0
[CODE]

I do not know what "invalid page number: 0 (Error Code:1)" could hint at. Is there any way to change the page numbers in a epub or something?

Any tipps would be much much appreciated!! Thanks a bunch in advance!!