Hi, I have the same problem as @fantat, I have logged in as admin, so I can change settings, but anyone else can’t login to site even I as admin from other browser, I have that error in wfConfig.php.
When I disable plugin by renaming directory, when user try to login it always redirects to login page. And I try to install Wordfence Assistant, but it can’t be activated, it says “1 plugin ativated”, but it’s not activated.