Fatal error: Uncaught Symfony\Component\Debug\Exception\FatalThrowableError: Undefined constant "Patchwork\Utf8\MB_OVERLOAD_STRING" in /customers/1/d/9/seifengasse.de/httpd.www/vendor/patchwork/utf8/src/Patchwork/Utf8/Bootup.php:45
Stack trace:
#0 /customers/1/d/9/seifengasse.de/httpd.www/vendor/patchwork/utf8/src/Patchwork/Utf8/Bootup.php(26): Patchwork\Utf8\Bootup::initMbstring()
#1 /customers/1/d/9/seifengasse.de/httpd.www/vendor/contao/core-bundle/src/ContaoCoreBundle.php(45): Patchwork\Utf8\Bootup::initAll()
#2 /customers/1/d/9/seifengasse.de/httpd.www/app/bootstrap.php.cache(1413): Contao\CoreBundle\ContaoCoreBundle->boot()
#3 /customers/1/d/9/seifengasse.de/httpd.www/app/bootstrap.php.cache(1441): Symfony\Component\HttpKernel\Kernel->boot()
#4 /customers/1/d/9/seifengasse.de/httpd.www/system/initialize.php(19): Symfony\Component\HttpKernel\Kernel->handle(Object(Symfony\Component\HttpFoundation\Request))
#5 /customers/1/d/9/seifengasse.de/httpd.www/index.php(16): require('/customers/1/d/...')
#6 {main}
  thrown in /customers/1/d/9/seifengasse.de/httpd.www/vendor/patchwork/utf8/src/Patchwork/Utf8/Bootup.php on line 45