For 37 of my PDFs, The Count Pages plugin worked. But for six of them, the Count Pages plugin gives this error:
(calibre, version 3.8.0)
WARNING: Page/word/statistics warnings: Could not analyse some statistics in 1 of 1 books, for reasons shown in details below.
A Tale of Two Cities (No identifiers for selected download sources)
I clicked the same button for all PDFs, so I don't know why some PDFs would invoke a download attempt and others wouldn't.
