Error in Apache Log

Hello,

I found this error message in the Apache log – what does that mean?

Thanks a lot for your help!

[Tue Mar 14 11:00:16.805073 2023] [proxy_fcgi:error] [pid 3492730:tid 140673231501056] [client 103.35.64.73:58194] AH01071: Got error ‘PHP message: PHP Fatal error: Uncaught Error: Call to undefined function login_header() in /var/www/share/buyhigh.de/htdocs/wp-content/plugins/google-authenticator/google-authenticator.php:638\nStack trace:\n#0 /var/www/share/buyhigh.de/htdocs/wp-content/plugins/google-authenticator/google-authenticator.php(625): GoogleAuthenticator->secondary_login_screen()\n#1 /var/www/share/buyhigh.de/htdocs/wp-includes/class-wp-hook.php(308): GoogleAuthenticator->check_otp(Object(WP_User), ‘admin’, ‘admin00’)\n#2 /var/www/share/buyhigh.de/htdocs/wp-includes/plugin.php(205): WP_Hook->apply_filters(Object(WP_Error), Array)\n#3 /var/www/share/buyhigh.de/htdocs/wp-includes/pluggable.php(614): apply_filters(‘authenticate’, NULL, ‘admin’, ‘admin00’)\n#4 /var/www/share/buyhigh.de/htdocs/wp-includes/class-wp-xmlrpc-server.php(295): wp_authenticate(‘admin’, ‘admin00’)\n#5 /var/www/share/buyhigh.de/htdocs/wp-includes/class-wp-xmlrpc-server.php(4821): wp_xmlrpc_server->login(‘admin’, ‘admin00′)\n#6 /var/www/share/buyhigh.de/htd…’
[Tue Mar 14 11:00:57.149886 2023] [proxy_fcgi:error] [pid 3492730:tid 140673466496768] [client 162.214.59.10:14252] AH01071: Got error ‘PHP message: PHP Fatal error: Uncaught Error: Call to undefined function login_header() in /var/www/share/buyhigh.de/htdocs/wp-content/plugins/google-authenticator/google-authenticator.php:638\nStack trace:\n#0 /var/www/share/buyhigh.de/htdocs/wp-content/plugins/google-authenticator/google-authenticator.php(625): GoogleAuthenticator->secondary_login_screen()\n#1 /var/www/share/buyhigh.de/htdocs/wp-includes/class-wp-hook.php(308): GoogleAuthenticator->check_otp(Object(WP_User), ‘admin’, ‘admin00’)\n#2 /var/www/share/buyhigh.de/htdocs/wp-includes/plugin.php(205): WP_Hook->apply_filters(Object(WP_Error), Array)\n#3 /var/www/share/buyhigh.de/htdocs/wp-includes/pluggable.php(614): apply_filters(‘authenticate’, NULL, ‘admin’, ‘admin00’)\n#4 /var/www/share/buyhigh.de/htdocs/wp-includes/class-wp-xmlrpc-server.php(295): wp_authenticate(‘admin’, ‘admin00’)\n#5 /var/www/share/buyhigh.de/htdocs/wp-includes/class-wp-xmlrpc-server.php(4821): wp_xmlrpc_server->login(‘admin’, ‘admin00′)\n#6 /var/www/share/buyhigh.de/htd…’