에러로그가 계속 발생합니다.. Use of undefined constant G5_JS_VER - assumed 'G5_JS_VER' 채택완료

윈도우 서버에서 그누보드를 돌리는중입니다.
에러로그가 갑자기 많이생겨 로그를 보니 아래와 같은 에러로그가 계속 쌓이고있네요.. ㅠㅠ

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에러로그

PHP Warning:  Use of undefined constant G5_JS_VER - assumed 'G5_JS_VER' (this will throw an Error in a future version of PHP) in E:\\htdocs\\gnuboard5\\theme\\NB-Basic\\head.sub.php on line 117
PHP Warning:  Use of undefined constant G5_JS_VER - assumed 'G5_JS_VER' (this will throw an Error in a future version of PHP) in E:\\htdocs\\gnuboard5\\theme\\NB-Basic\\head.sub.php on line 118
PHP Warning:  Use of undefined constant G5_JS_VER - assumed 'G5_JS_VER' (this will throw an Error in a future version of PHP) in E:\\htdocs\\gnuboard5\\theme\\NB-Basic\\head.sub.php on line 121
PHP Fatal error:  Uncaught Error: Call to a member function run() on null in E:\\htdocs\\gnuboard5\\lib\\common.lib.php:2493\nStack trace:\n#0 E:\\htdocs\\gnuboard5\\theme\\NB-Basic\\tail.sub.php(17): html_end()\n#1 E:\\htdocs\\gnuboard5\\tail.sub.php(5): require_once('E:\\\\htdocs\\\\allpa...')\n#2 E:\\htdocs\\gnuboard5\\bbs\\alert.php(116): include_once('E:\\\\htdocs\\\\allpa...')\n#3 E:\\htdocs\\gnuboard5\\lib\\common.lib.php(179): include_once('E:\\\\htdocs\\\\allpa...')\n#4 E:\\htdocs\\gnuboard5\\extend\\user.config.php(13): alert('\\xED\\x9A\\x8C\\xEC\\x9B\\x90\\xEA\\xB0\\x80\\xEC\\x9E\\x85\\xEC\\x9D\\x84...', 'http://hosiggi....')\n#5 E:\\htdocs\\gnuboard5\\common.php(682): include_once('E:\\\\htdocs\\\\allpa...')\n#6 E:\\htdocs\\gnuboard5\\bbs\\_common.php(2): include_once('E:\\\\htdocs\\\\allpa...')\n#7 E:\\htdocs\\gnuboard5\\bbs\\register.php(2): include_once('E:\\\\htdocs\\\\allpa...')\n#8 {main}\n  thrown in E:\\htdocs\\gnuboard5\\lib\\common.lib.php on line 2493
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head.sub.php 소스

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부분을 수정해줘야되는건가요?

php 를 업그레이드하거나 한건없는데 갑자기 생기기 시작했습니다.