Error after installation (Invalid server index index #DB_SLAVE)

[InVinCiblezz]

I am using

MediaWiki | 1.35.1
-- | --
PHP | 7.4.11 (apache2handler)
MySQL | 5.7.32
ICU | 50.2

[X@wJPkh1YmjNUkNJM59McwAAAAA] /wiki/%E7%89%B9%E6%AE%8A:UsersWatchList UnexpectedValueException from line 486 of /var/www/w/includes/libs/rdbms/loadbalancer/LoadBalancer.php: Invalid server index index #DB_SLAVE

Backtrace:

#0 /var/www/w/includes/libs/rdbms/loadbalancer/LoadBalancer.php(899): Wikimedia\Rdbms\LoadBalancer->getConnectionIndex(string, array, string)
#1 /var/www/w/includes/libs/rdbms/loadbalancer/LoadBalancer.php(1046): Wikimedia\Rdbms\LoadBalancer->getConnection(string, array, string, integer)
#2 /var/www/w/includes/GlobalFunctions.php(2469): Wikimedia\Rdbms\LoadBalancer->getMaintenanceConnectionRef(string, string, string)
#3 /var/www/w/extensions/UsersWatchlist/includes/SpecialUsersWatchList.php(386): wfGetDB(string, string)
#4 /var/www/w/extensions/UsersWatchlist/includes/SpecialUsersWatchList.php(182): SpecialUsersWatchList->getDB()
#5 /var/www/w/extensions/UsersWatchlist/includes/SpecialUsersWatchList.php(283): SpecialUsersWatchList->buildMainQueryConds(FormOptions)
#6 /var/www/w/includes/specialpage/ChangesListSpecialPage.php(636): SpecialUsersWatchList->getRows()
#7 /var/www/w/extensions/UsersWatchlist/includes/SpecialUsersWatchList.php(78): ChangesListSpecialPage->execute(NULL)
#8 /var/www/w/includes/specialpage/SpecialPage.php(600): SpecialUsersWatchList->execute(NULL)
#9 /var/www/w/includes/specialpage/SpecialPageFactory.php(635): SpecialPage->run(NULL)
#10 /var/www/w/includes/MediaWiki.php(307): MediaWiki\SpecialPage\SpecialPageFactory->executePath(Title, RequestContext)
#11 /var/www/w/includes/MediaWiki.php(940): MediaWiki->performRequest()
#12 /var/www/w/includes/MediaWiki.php(543): MediaWiki->main()
#13 /var/www/w/index.php(53): MediaWiki->run()
#14 /var/www/w/index.php(46): wfIndexMain()
#15 {main}