שגיאה פנימית

[Z1Pffv353mtb@-6JezyNJwAAAE0] /mediawiki/index.php?title=%D7%A9%D7%99%D7%97%D7%AA_%D7%9E%D7%A9%D7%AA%D7%9E%D7%A9:Kinslayer&action=history Error from line 45 of /var/www/vhosts/israherb.org/httpdocs/phpBB3/vendor/patchwork/utf8/src/Patchwork/Utf8/Bootup.php: Undefined constant "Patchwork\Utf8\MB_OVERLOAD_STRING"

Backtrace:

#0 /var/www/vhosts/israherb.org/httpdocs/phpBB3/includes/utf/utf_tools.php(28): Patchwork\Utf8\Bootup::initMbstring()
#1 /var/www/vhosts/israherb.org/httpdocs/mediawiki/extensions/Auth_phpBB/Auth_phpBB.php(815): require_once(string)
#2 /var/www/vhosts/israherb.org/httpdocs/mediawiki/extensions/Auth_phpBB/Auth_phpBB.php(1076): Auth_phpBB->loadPHPFiles()
#3 /var/www/vhosts/israherb.org/httpdocs/mediawiki/extensions/Auth_phpBB/Auth_phpBB.php(583): Auth_phpBB->utf8()
#4 [internal function]: Auth_phpBB->getCanonicalName()
#5 /var/www/vhosts/israherb.org/httpdocs/mediawiki/includes/auth/AuthManager.php(243): call_user_func_array()
#6 /var/www/vhosts/israherb.org/httpdocs/mediawiki/includes/user/User.php(1233): MediaWiki\Auth\AuthManager::callLegacyAuthPlugin()
#7 /var/www/vhosts/israherb.org/httpdocs/mediawiki/includes/user/User.php(595): User::getCanonicalName()
#8 /var/www/vhosts/israherb.org/httpdocs/mediawiki/includes/skins/Skin.php(357): User::newFromName()
#9 /var/www/vhosts/israherb.org/httpdocs/mediawiki/includes/skins/SkinTemplate.php(1348): Skin->getRelevantUser()
#10 /var/www/vhosts/israherb.org/httpdocs/mediawiki/includes/skins/SkinTemplate.php(482): SkinTemplate->buildNavUrls()
#11 /var/www/vhosts/israherb.org/httpdocs/mediawiki/includes/skins/SkinTemplate.php(249): SkinTemplate->prepareQuickTemplate()
#12 /var/www/vhosts/israherb.org/httpdocs/mediawiki/includes/OutputPage.php(2388): SkinTemplate->outputPage()
#13 /var/www/vhosts/israherb.org/httpdocs/mediawiki/includes/MediaWiki.php(868): OutputPage->output()
#14 /var/www/vhosts/israherb.org/httpdocs/mediawiki/includes/MediaWiki.php(880): MediaWiki->{closure}()
#15 /var/www/vhosts/israherb.org/httpdocs/mediawiki/includes/MediaWiki.php(524): MediaWiki->main()
#16 /var/www/vhosts/israherb.org/httpdocs/mediawiki/index.php(42): MediaWiki->run()
#17 {main}