Loading book failed

[Dragonhome]

This is happening for a lot of my books. When I try to open them I get the error below.

Background: These were books that were in a friend Calibre, and he send me the just epub files for them (not the folders). I added them to my library using "add books".

I have since added more books to Calibre before I found that my frinds books wouldn't open.

I need to know how to remove books just the corrupted from Calibre with these errors. I added almost 1000 books and I really don't want to have to go test each one.

If you have a solution, please write it in plain language to make it easy to understand.

BTW, I do have the calibre "Quality Check" plug in, but I can't find anything that even remotely addresses this problem. I believe it is the most recent version since I just downloaded and installed it.

Thanks!

calibre, version 5.31.1
ERROR: Loading book failed: Failed to open the book at C:\Users\Judith Perry\Calibre Library\Summer Prescott\BBQ, Bikers, and Murder (13792)\BBQ, Bikers, and Murder - Summer Prescott.epub. Click "Show details" for more info.

Failed to convert book: C:\Users\Judith Perry\Calibre Library\Summer Prescott\BBQ, Bikers, and Murder (13792)\BBQ, Bikers, and Murder - Summer Prescott.epub with error:
DeDRM v7.2.1: Trying to decrypt BBQ, Bikers, and Murder - Summer Prescott.epub
DeDRM v7.2.1: Verifying zip archive integrity
DeDRM v7.2.1: Error 'File is not a zip file' when checking zip archive
InputFormatPlugin: EPUB Input running
on C:\Users\Judith Perry\Calibre Library\Summer Prescott\BBQ, Bikers, and Murder (13792)\BBQ, Bikers, and Murder - Summer Prescott.epub
EPUB appears to be invalid ZIP file, trying a more forgiving ZIP parser
Failed to run pipe worker with command: from calibre.srv.render_book import viewer_main; viewer_main()
Traceback (most recent call last):
  File "calibre\ebooks\metadata\epub.py", line 160, in get_zip_reader
  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 "calibre\customize\ui.py", line 432, in get_file_type_metadata
  File "calibre\customize\builtins.py", line 169, in get_metadata
  File "calibre\ebooks\metadata\epub.py", line 237, in get_quick_metadata
  File "calibre\ebooks\metadata\epub.py", line 216, in get_metadata
  File "calibre\ebooks\metadata\epub.py", line 163, in get_zip_reader
  File "calibre\utils\localunzip.py", line 264, in __init__
  File "calibre\utils\localunzip.py", line 240, in _extractall
ValueError: Not a ZIP file
Running file type plugin DeDRM failed with traceback:
Traceback (most recent call last):
  File "calibre_plugins.dedrm.__init__", line 210, in ePubDecrypt
  File "calibre_plugins.dedrm.zipfix", line 53, in __init__
  File "C:\Users\Judith Perry\AppData\Roaming\calibre\plugins\DeDRM.zip\zipfilerugged.py", line 683, in __init__
  File "C:\Users\Judith Perry\AppData\Roaming\calibre\plugins\DeDRM.zip\zipfilerugged.py", line 709, in _GetContents
  File "C:\Users\Judith Perry\AppData\Roaming\calibre\plugins\DeDRM.zip\zipfilerugged.py", line 721, in _RealGetContents
zipfilerugged.BadZipfile: File is not a zip file

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "calibre\customize\ui.py", line 175, in _run_filetype_plugins
  File "calibre_plugins.dedrm.__init__", line 644, in run
  File "calibre_plugins.dedrm.__init__", line 214, in ePubDecrypt
Exception: 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 197, in main
  File "<string>", line 1, in <module>
  File "calibre\srv\render_book.py", line 823, in viewer_main
  File "calibre\srv\render_book.py", line 814, in render_for_viewer
  File "calibre\srv\render_book.py", line 791, in render
  File "calibre\ebooks\oeb\iterator\book.py", line 63, in extract_book
  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 240, in _extractall
ValueError: Not a ZIP file

[theducks]

If you read both sections last lines:
Damaged Zip file (EPUB is a Zip with a defined structure)