Fatal error: Uncaught Error: Undefined constant "Patchwork\Utf8\MB_OVERLOAD_STRING" in /home/httpd/vhosts/sevisa.ch/httpdocs/concrete5/updates/concrete5-8.5.5_remote_updater/concrete/vendor/patchwork/utf8/src/Patchwork/Utf8/Bootup.php:45
Stack trace:
#0 /home/httpd/vhosts/sevisa.ch/httpdocs/concrete5/updates/concrete5-8.5.5_remote_updater/concrete/vendor/patchwork/utf8/src/Patchwork/Utf8/Bootup.php(26): Patchwork\Utf8\Bootup::initMbstring()
#1 /home/httpd/vhosts/sevisa.ch/httpdocs/concrete5/updates/concrete5-8.5.5_remote_updater/concrete/bootstrap/start.php(19): Patchwork\Utf8\Bootup::initAll()
#2 /home/httpd/vhosts/sevisa.ch/httpdocs/concrete5/updates/concrete5-8.5.5_remote_updater/concrete/dispatcher.php(36): require('/home/httpd/vho...')
#3 /home/httpd/vhosts/sevisa.ch/httpdocs/concrete5/concrete/bootstrap/configure.php(55): require('/home/httpd/vho...')
#4 /home/httpd/vhosts/sevisa.ch/httpdocs/concrete5/concrete/dispatcher.php(13): require('/home/httpd/vho...')
#5 /home/httpd/vhosts/sevisa.ch/httpdocs/concrete5/index.php(3): require('/home/httpd/vho...')
#6 {main}
  thrown in /home/httpd/vhosts/sevisa.ch/httpdocs/concrete5/updates/concrete5-8.5.5_remote_updater/concrete/vendor/patchwork/utf8/src/Patchwork/Utf8/Bootup.php on line 45