Deprecated: Return type of JDate::format($format, $local = false, $translate = true) should either be compatible with DateTime::format(string $format): string, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /usr/home/cosaut.com/web/libraries/joomla/date/date.php on line 279

Deprecated: Return type of JDate::setTimezone($tz) should either be compatible with DateTime::setTimezone(DateTimeZone $timezone): DateTime, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /usr/home/cosaut.com/web/libraries/joomla/date/date.php on line 396

Fatal error: Uncaught Error: Undefined constant "MB_OVERLOAD_STRING" in /usr/home/cosaut.com/web/libraries/vendor/joomla/string/src/phputf8/utf8.php:38
Stack trace:
#0 /usr/home/cosaut.com/web/libraries/vendor/composer/autoload_real.php(66): require()
#1 /usr/home/cosaut.com/web/libraries/vendor/composer/autoload_real.php(56): composerRequire205c915b9c7d3e718e7c95793ee67ffe('2fb9d6f23c8e8fa...', '/usr/home/cosau...')
#2 /usr/home/cosaut.com/web/libraries/vendor/autoload.php(7): ComposerAutoloaderInit205c915b9c7d3e718e7c95793ee67ffe::getLoader()
#3 /usr/home/cosaut.com/web/libraries/cms.php(33): require('/usr/home/cosau...')
#4 /usr/home/cosaut.com/web/includes/framework.php(23): require_once('/usr/home/cosau...')
#5 /usr/home/cosaut.com/web/index.php(40): require_once('/usr/home/cosau...')
#6 {main}
  thrown in /usr/home/cosaut.com/web/libraries/vendor/joomla/string/src/phputf8/utf8.php on line 38