[estiew2002]

I have an epub file that was imported into Calibre. I downloaded metadata for it without a problem. but when trying to open I get error message "Could not open ebook. Not a zip file" . Below i copied the details from the error message. the ebook was downloaded with other ebooks. One of them opened without a problem about a year ago. any other books from that collection i tried to open give the same error. the ebook is over 20MB in size but I have have another book this size and it works fine.

calibre, version 0.9.40
ERROR: Could not open ebook: Not a ZIP file

Traceback (most recent call last):
File "site-packages\calibre\gui2\viewer\main.py", line 40, in run
File "threading.py", line 763, in run
File "site-packages\calibre\ebooks\oeb\iterator\book.py", line 99, in __enter__
File "site-packages\calibre\customize\conversion.py", line 241, in __call__
File "site-packages\calibre\ebooks\conversion\plugins\epub_in put.py", line 167, in convert
File "site-packages\calibre\utils\localunzip.py", line 223, in extractall
File "site-packages\calibre\utils\localunzip.py", line 210, in _extractall
ValueError: Not a ZIP file


thanks in advance