Call to undefined method MediaWiki\Auth\AuthManager::singleton()

[darkshade9]

Mediawiki 1.37

Latest PluggableAuth installed
Latest SteamAuth installed

Not sure if this is a PluggableAuth issue or a problem with SteamAuth, but wanted to report it:

[b060034da28537bd888eea4e] /wiki/Special:PluggableAuthLogin Error: Call to undefined method MediaWiki\Auth\AuthManager::singleton()

Backtrace:

from /bitnami/mediawiki/extensions/SteamAuth/src/SteamAuth.php(16)
#0 /bitnami/mediawiki/extensions/PluggableAuth/includes/PluggableAuthLogin.php(36): SteamAuth->authenticate()
#1 /opt/bitnami/mediawiki/includes/specialpage/SpecialPage.php(647): PluggableAuthLogin->execute()
#2 /opt/bitnami/mediawiki/includes/specialpage/SpecialPageFactory.php(1366): SpecialPage->run()
#3 /opt/bitnami/mediawiki/includes/MediaWiki.php(314): MediaWiki\SpecialPage\SpecialPageFactory->executePath()
#4 /opt/bitnami/mediawiki/includes/MediaWiki.php(930): MediaWiki->performRequest()
#5 /opt/bitnami/mediawiki/includes/MediaWiki.php(564): MediaWiki->main()
#6 /opt/bitnami/mediawiki/index.php(53): MediaWiki->run()
#7 /opt/bitnami/mediawiki/index.php(46): wfIndexMain()
#8 {main}