WBB 3.0.x WBB 3.0.9 Probleme beim einrichten

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Fatal error: PHP notice in file /mnt/web3/32/52/52184552/htdocs/wcf/lib/util/HeaderUtil.class.php (23): Use of undefined constant HTTP_CONTENT_TYPE_XHTML - assumed 'HTTP_CONTENT_TYPE_XHTML'

Information:

error message: PHP notice in file /mnt/web3/32/52/52184552/htdocs/wcf/lib/util/HeaderUtil.class.php (23): Use of undefined constant HTTP_CONTENT_TYPE_XHTML - assumed 'HTTP_CONTENT_TYPE_XHTML'
error code: 0
file: /mnt/web3/32/52/52184552/htdocs/wcf/lib/system/WCF.class.php (255)
php version: 5.2.10
wcf version: 1.0.11 RC 1 (Horizon)
date: Sat, 10 Oct 2009 18:05:11 +0000
request: /wcf/acp/index.php?page=Package&action=install&queueID=3&step=installationFrame&packageID=1&s=328bc12fa8fad9dacce8c1fe14f1ceb4c5dcd1b8
referer: [URL]http://forum.comfort-wings.de/wcf/acp/index.php?page=Package&step=finish&queueID=2&action=install&packageID=1&s=328bc12fa8fad9dacce8c1fe14f1ceb4c5dcd1b8[/URL]
Stacktrace:

#0 /mnt/web3/32/52/52184552/htdocs/wcf/lib/util/HeaderUtil.class.php(23): WCF::handleError(8, 'Use of undefine...', '/mnt/web3/32/52...', 23, Array)
#1 /mnt/web3/32/52/52184552/htdocs/wcf/lib/system/template/Template.class.php(228): HeaderUtil::sendHeaders()
#2 /mnt/web3/32/52/52184552/htdocs/wcf/lib/acp/package/PackageInstallationQueue.class.php(459): Template->display('packageInstalla...')
#3 /mnt/web3/32/52/52184552/htdocs/wcf/lib/acp/package/PackageInstallation.class.php(339): PackageInstallationQueue->showPackageInstallationException(Object(SystemException))
#4 /mnt/web3/32/52/52184552/htdocs/wcf/lib/acp/package/PackageInstallation.class.php(52): PackageInstallation->install()
#5 /mnt/web3/32/52/52184552/htdocs/wcf/lib/acp/page/PackagePage.class.php(42): PackageInstallation->__construct(3)
#6 /mnt/web3/32/52/52184552/htdocs/wcf/lib/page/AbstractPage.class.php(36): PackagePage->show()
#7 /mnt/web3/32/52/52184552/htdocs/wcf/lib/util/RequestHandler.class.php(63): AbstractPage->__construct()
#8 /mnt/web3/32/52/52184552/htdocs/wcf/lib/util/RequestHandler.class.php(91): RequestHandler->__construct('Package', Array, 'page')
#9 /mnt/web3/32/52/52184552/htdocs/wcf/acp/index.php(8): RequestHandler::handle(Array)
#10 {main}