"
BetterRed wrote: . . . I suggest you report your issue as a Bug/Enhancement, see ==>> *calibre - Bugs* (https://calibre-ebook.com/bugs) You will get a direct response from Kovid there. BR . . ."
Oh, great to know a
https://calibre-ebook.com/bugs site exists.
"Kovid Goyal wrote: . . . There was a bug which caused calibre to choke on a particular type of malformed metadata in EPUB3 files . . . fixed . . . wait for the next calibre preview/release and you will be able to import your EPUB with no issues . . ."
There is no response to a search for "AttributeError: Custom field name '' must begin with '#'" at
https://calibre-ebook.com/bugs - what "Bug" is this situation listed under?
Anyway, glad to know this was noticed and will be addressed via a subsequent release.
As ever, thank you, Kovid Goyal - and all the folks at
https://calibre-ebook.com/about#contributors - for the superlative Calibre Ebook
universe of programs for eBook reading, converting, library management, editing, emailing, researching, and more!
.