Thread:Extension talk:Scribunto/Fatal error: Class 'MapCacheLRU' not found in /var/www/mediawiki/extensions/Scribunto/engines/LuaCommon/UstringLibrary.php on line 37

Anyone have any suggestions on where to go from here? Followed all the instructions to install and enable Scribunto, mbstring is enabled in php. Xml exported some template pages from here, imported them into my wiki and when I visit a template page it is blank. With error reporting enabled, I get the error that is the subject of this message.

Thanks!