Error processing MakePdfBook command:

Encountered error while attempting to execute MakePdfBook command \'render\' for target \'Draft_Kingdom_Law_Handbook\'.

Error was:
Exception: Error: couldn't find the end of the \href directive in line 339 of book.original.tex
The line was:
  1.19}REVSTOP

 in /var/www/html/extensions/MakePdfBook/src/MakePdfBook.php:51
Stack trace:
#0 /var/www/html/extensions/MakePdfBook/src/SpecialMakePdfBook.php(201): MediaWiki\Extension\MakePdfBook\MakePdfBook->render(Object(MediaWiki\Extension\MakePdfBook\Book))
#1 /var/www/html/extensions/MakePdfBook/src/SpecialMakePdfBook.php(35): MediaWiki\Extension\MakePdfBook\SpecialMakePdfBook->servePdf('Draft_Kingdom_L...', Array)
#2 /var/www/html/includes/specialpage/SpecialPage.php(728): MediaWiki\Extension\MakePdfBook\SpecialMakePdfBook->execute('render/Draft_Ki...')
#3 /var/www/html/includes/specialpage/SpecialPageFactory.php(1717): MediaWiki\SpecialPage\SpecialPage->run('render/Draft_Ki...')
#4 /var/www/html/includes/actions/ActionEntryPoint.php(504): MediaWiki\SpecialPage\SpecialPageFactory->executePath('MakePdfBook/ren...', Object(MediaWiki\Context\RequestContext))
#5 /var/www/html/includes/actions/ActionEntryPoint.php(146): MediaWiki\Actions\ActionEntryPoint->performRequest()
#6 /var/www/html/includes/MediaWikiEntryPoint.php(200): MediaWiki\Actions\ActionEntryPoint->execute()
#7 /var/www/html/index.php(58): MediaWiki\MediaWikiEntryPoint->run()
#8 {main}