Fatal error: Uncaught Error: Undefined constant "MB_OVERLOAD_STRING" in /data/web/virtuals/132121/virtual/www/subdom/mtc/vendor/joomla/string/src/phputf8/utf8.php:38
Stack trace:
#0 /data/web/virtuals/132121/virtual/www/subdom/mtc/vendor/composer/autoload_real.php(66): require()
#1 /data/web/virtuals/132121/virtual/www/subdom/mtc/vendor/composer/autoload_real.php(56): composerRequirec21048a87d303368358c9dc479a98616('2fb9d6f23c8e8fa...', '/data/web/virtu...')
#2 /data/web/virtuals/132121/virtual/www/subdom/mtc/vendor/autoload.php(7): ComposerAutoloaderInitc21048a87d303368358c9dc479a98616::getLoader()
#3 /data/web/virtuals/132121/virtual/www/subdom/mtc/app/autoload.php(15): require('/data/web/virtu...')
#4 /data/web/virtuals/132121/virtual/www/subdom/mtc/index.php(19): require_once('/data/web/virtu...')
#5 {main}
thrown in /data/web/virtuals/132121/virtual/www/subdom/mtc/vendor/joomla/string/src/phputf8/utf8.php on line 38