This extension is broken under MediaWiki 1.34:
- It uses DB_SLAVE instead of DB_REPLICA
- After fixing this error, I still get an error :
[b2c769246b4f1dc886c4c019] /w/index.php?title=Category:Office_supplies&action=pdfbook Error from line 67 of /var/www/mediawiki/w/extensions/PdfBook/PdfBookAction.php: Cannot access protected property Wikimedia\Rdbms\ResultWrapper::$result
Backtrace:
#0 /var/www/mediawiki/w/includes/MediaWiki.php(511): PdfBookAction->show()
#1 /var/www/mediawiki/w/includes/MediaWiki.php(302): MediaWiki->performAction(CategoryPage, Title)
#2 /var/www/mediawiki/w/includes/MediaWiki.php(900): MediaWiki->performRequest()
#3 /var/www/mediawiki/w/includes/MediaWiki.php(527): MediaWiki->main()
#4 /var/www/mediawiki/w/index.php(44): MediaWiki->run()
#5 {main}