ReflectionException: Function include() does not exist in /var/www/woltlab/www/lib/core.functions.php

An Exception was thrown while handling an Exception:

ReflectionException: Function include() does not exist in /var/www/woltlab/www/lib/core.functions.php:723
Stack trace:
#0 /var/www/woltlab/www/lib/core.functions.php(723): ReflectionFunction->__construct('include')
#1 [internal function]: wcf\functions\exception\{closure}(Array)
#2 /var/www/woltlab/www/lib/core.functions.php(712): array_map(Object(Closure), Array)
#3 /var/www/woltlab/www/lib/core.functions.php(256): wcf\functions\exception\sanitizeStacktrace(Object(BadMethodCallException), true)
#4 /var/www/woltlab/www/lib/core.functions.php(285): wcf\functions\exception\logThrowable(Object(BadMethodCallException), '/var/www/woltla...')
#5 /var/www/woltlab/www/lib/system/WCF.class.php(310): wcf\functions\exception\printThrowable(Object(BadMethodCallException))
#6 [internal function]: wcf\system\WCF::handleException(Object(BadMethodCallException))
#7 {main}

was thrown while:

BadMethodCallException: The method can only be called, if the thread is set. in /var/www/woltlab/community/lib/data/modification/log/ViewableThreadModificationLog.class.php:101
Stack trace:
#0 /var/www/woltlab/www/templates/compiled/2_wbb_1_thread.php(5151): wbb\data\modification\log\ViewableThreadModificationLog->showAuthor()
#1 /var/www/woltlab/www/lib/system/template/TemplateEngine.class.php(346): include('/var/www/woltla...')
#2 /var/www/woltlab/www/lib/page/AbstractPage.class.php(339): wcf\system\template\TemplateEngine->display('thread', 'wbb')
#3 /var/www/woltlab/www/lib/page/AbstractPage.class.php(120): wcf\page\AbstractPage->show()
#4 /var/www/woltlab/www/lib/system/request/Request.class.php(89): wcf\page\AbstractPage->__run()
#5 /var/www/woltlab/www/lib/system/request/RequestHandler.class.php(119): wcf\system\request\Request->execute()
#6 /var/www/woltlab/community/index.php(11): wcf\system\request\RequestHandler->handle('wbb')
#7 {main}

was handled.