Joomla von 3.10 auf 4.0 umstellen - Fehler bei Punkt 'Fehleranzeige auf Maximum umstellen'

  • Joomla Version
    3.10
    PHP Version
    PHP 8.2.x
    Hoster
    lokal
    Link (URL) zur Seite mit dem Problem
    baan-suan.ch

    Hallo zusammen
    beim Umstellen von Joomla 3.10 auf 4.0 lief alles gut bis zum o.e. Punkt. Seit dem ist eine Fehlermeldung angezeigt, die ich nicht mehr ausblenden, bzw rücksetzen kann.

    Code
    Deprecated: Joomla\Input\Input implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary) in /home/httpd/vhosts/cc-finanzberatung.ch/baan-suan.ch/libraries/vendor/joomla/input/src/Input.php on line 41 Deprecated: Return type of Joomla\Input\Input::count() should either be compatible with Countable::count(): int, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/httpd/vhosts/cc-finanzberatung.ch/baan-suan.ch/libraries/vendor/joomla/input/src/Input.php on line 170 Deprecated: Joomla\CMS\Input\Input implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary) in /home/httpd/vhosts/cc-finanzberatung.ch/baan-suan.ch/libraries/src/Input/Input.php on line 31 Warning: session_name(): Session name cannot be changed after headers have already been sent in /home/httpd/vhosts/cc-finanzberatung.ch/baan-suan.ch/libraries/joomla/session/handler/native.php on line 128 Deprecated: Joomla\CMS\Input\Cookie implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary) in /home/httpd/vhosts/cc-finanzberatung.ch/baan-suan.ch/libraries/src/Input/Cookie.php on line 0 Warning: session_cache_limiter(): Session cache limiter cannot be changed after headers have already been sent in /home/httpd/vhosts/cc-finanzberatung.ch/baan-suan.ch/libraries/joomla/session/handler/native.php on line 235 Error: Failed to start application: Failed to start the session because headers have already been sent by "/home/httpd/vhosts/cc-finanzberatung.ch/baan-suan.ch/libraries/vendor/joomla/input/src/Input.php" at line 41.

    Kennt das jemand, bzw kann mir jemand weiterhelfen? Bitte in einfachen Worten, bin kein Fachmann. Danke.