[KazuyaDarklight]

I just updated Calibre to 5.34 and I'm having trouble adding books to the library. I'll 11 from the same series are generating the same basic error set.

calibre, version 5.34.0
WARNING: Errors while adding: There were problems adding some files, click "Show details" for more information


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Failed to add the file D:\Users\<me>\Downloads\Slayers\slayers-volume-3.epub to the book: Slayers: Volume 3
With error:
Traceback (most recent call last):
  File "calibre\gui2\add.py", line 488, in add_formats
  File "calibre\db\cache.py", line 1577, in add_format
  File "calibre\db\cache.py", line 1534, in _do_add_format
  File "calibre\db\backend.py", line 1627, in add_format
  File "shutil.py", line 205, in copyfileobj
OSError: [Errno 22] Invalid argument

These books do get added to the listing still, and I can find their files in the library directory, but actually trying to interact with them generates errors about formats not being available, even thoguh I see the file in the database directory, and I got this for trying to convert to mobi for my Kindle.

calibre, version 5.34.0 (win32, embedded-python: True)
Conversion error: Failed: Convert book 1 of 1 (Slayers: Volume 3)

Convert book 1 of 1 (Slayers: Volume 3)
Conversion options changed from defaults:
  read_metadata_from_opf: 'C:\\Users\\<me>\\AppData\\Local\\Temp\\calibre_quu0rlc4\\9ey4hz33.opf'
  cover: 'C:\\Users\\<me>\\AppData\\Local\\Temp\\calibre_quu0rlc4\\arl4o6u9.jpeg'
  output_profile: 'tablet'
  verbose: 2
Resolved conversion options
calibre version: 5.34.0
{'asciiize': False,
 'author_sort': None,
 'authors': None,
 'base_font_size': 0.0,
 'book_producer': None,
 'change_justification': 'original',
 'chapter': "//*[((name()='h1' or name()='h2') and re:test(., "
            "'\\s*((chapter|book|section|part)\\s+)|((prolog|prologue|epilogue)(\\s+|$))', "
            "'i')) or @class = 'chapter']",
 'chapter_mark': 'pagebreak',
 'comments': None,
 'cover': 'C:\\Users\\<me>\\AppData\\Local\\Temp\\calibre_quu0rlc4\\arl4o6u9.jpeg',
 'debug_pipeline': None,
 'dehyphenate': True,
 'delete_blank_paragraphs': True,
 'disable_font_rescaling': False,
 'dont_compress': False,
 'duplicate_links_in_toc': False,
 'embed_all_fonts': False,
 'embed_font_family': None,
 'enable_heuristics': False,
 'expand_css': False,
 'extra_css': None,
 'extract_to': None,
 'filter_css': '',
 '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 0x072AE1D8>,
 '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,
 'mobi_file_type': 'old',
 'mobi_ignore_margins': False,
 'mobi_keep_original_images': False,
 'mobi_toc_at_start': False,
 'no_chapters_in_toc': False,
 'no_inline_navbars': False,
 'no_inline_toc': False,
 'output_profile': <calibre.customize.profiles.TabletOutput object at 0x072AE6A0>,
 'page_breaks_before': '/',
 'personal_doc': '[PDOC]',
 'prefer_author_sort': False,
 'prefer_metadata_cover': False,
 'pretty_print': False,
 'pubdate': None,
 'publisher': None,
 'rating': None,
 'read_metadata_from_opf': 'C:\\Users\\<me>\\AppData\\Local\\Temp\\calibre_quu0rlc4\\9ey4hz33.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': '',
 'search_replace': '[]',
 'series': None,
 'series_index': None,
 'share_not_sync': False,
 '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': '[]',
 'transform_html_rules': '[]',
 'unsmarten_punctuation': False,
 'unwrap_lines': True,
 'use_auto_toc': False,
 'verbose': 2}
Failed to initialize plugin: 'C:\\Users\\<me>\\AppData\\Roaming\\calibre\\plugins\\DeDRM.zip'
Failed to initialize plugin: 'C:\\Users\\<me>\\AppData\\Roaming\\calibre\\plugins\\Goodreads.zip'
InputFormatPlugin: EPUB Input running
on C:\Users\<me>\AppData\Local\Temp\calibre_quu0rlc4\8ip6e3ai.epub
EPUB appears to be invalid ZIP file, trying a more forgiving ZIP parser
Traceback (most recent call last):
  File "calibre\ebooks\conversion\plugins\epub_input.py", line 259, in convert
  File "calibre\utils\zipfile.py", line 774, in __init__
  File "calibre\utils\zipfile.py", line 809, in _GetContents
  File "calibre\utils\zipfile.py", line 824, in _RealGetContents
calibre.utils.zipfile.BadZipfile: File is not a zip file

Traceback (most recent call last):
  File "calibre\ebooks\conversion\plugins\epub_input.py", line 259, in convert
  File "calibre\utils\zipfile.py", line 774, in __init__
  File "calibre\utils\zipfile.py", line 809, in _GetContents
  File "calibre\utils\zipfile.py", line 824, in _RealGetContents
calibre.utils.zipfile.BadZipfile: File is not a zip file

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "runpy.py", line 194, in _run_module_as_main
  File "runpy.py", line 87, in _run_code
  File "site.py", line 82, in <module>
  File "site.py", line 77, in main
  File "site.py", line 49, in run_entry_point
  File "calibre\utils\ipc\worker.py", line 216, in main
  File "calibre\gui2\convert\gui_conversion.py", line 41, in gui_convert_override
  File "calibre\gui2\convert\gui_conversion.py", line 28, in gui_convert
  File "calibre\ebooks\conversion\plumber.py", line 1111, in run
  File "calibre\customize\conversion.py", line 244, in __call__
  File "calibre\ebooks\conversion\plugins\epub_input.py", line 266, in convert
  File "calibre\utils\localunzip.py", line 253, in extractall
  File "calibre\utils\localunzip.py", line 194, in _extractall
  File "calibre\utils\localunzip.py", line 146, in read_local_file_header
  File "calibre\utils\localunzip.py", line 98, in find_data_descriptor
ValueError: Failed to find data descriptor signature. Data descriptors without signatures are not supported.