[우분투16.04] XE 설치 흰화면 오류 로그 해결법좀부탁드립니다 ...

[Sat Jun 24 11:22:52.585387 2017] [:error] [pid 3430] [client 211.246.197.4:7151] PHP Fatal error:  Uncaught Error: Call to undefined function xml_parser_create() in /var/www/html/classes/xml/XmlParser.class.php:128\nStack trace:\n#0 /var/www/html/classes/xml/XmlLangParser.class.php(121): XmlParser->parse('<?xml version='...')\n#1 /var/www/html/classes/xml/XmlLangParser.class.php(75): XmlLangParser->_compile()\n#2 /var/www/html/classes/context/Context.class.php(930): XmlLangParser->compile()\n#3 /var/www/html/classes/context/Context.class.php(860): Context->_loadXmlLang('/var/www/html/m...')\n#4 /var/www/html/classes/context/Context.class.php(332): Context->loadLang('/var/www/html/m...')\n#5 /var/www/html/index.php(46): Context->init()\n#6 {main}\n  thrown in /var/www/html/classes/xml/XmlParser.class.php on line 128

아파치 , php7.0 , db 전부 다 잘설치 되어있고 연동도 되어있는데 위 오류가 뜹니다 ..