Custom Page Fehler

Information:
id: 878ceff7a21eb492f2833c789d3653ea9211fa07
error message: Accessing internal constant 'RELATIVE_WCF_DIR' is disallowed, please use '$__wcf->getPath()' instead
error code: 0
file: /home/www/borntosurvive.de/wcf/lib/system/template/TemplateScriptingCompiler.class.php (1051)
php version: 5.5.30
wcf version: 2.1.10 (Typhoon)
date: Wed, 30 Mar 2016 16:45:55 +0000
request: /acp/index.php?custom-page-add/&
referer: http://www.borntosurvive.de/acp/index.php?custom-page-import/&

Stacktrace:
#0 /home/www/borntosurvive.de/wcf/lib/system/template/TemplateScriptingCompiler.class.php(308): wcf\system\template\TemplateScriptingCompiler->compileOutputTag('@RELATIVE_WCF_D...')#1 /home/www/borntosurvive.de/wcf/lib/system/template/TemplateScriptingCompiler.class.php(243): wcf\system\template\TemplateScriptingCompiler->compileTag('@RELATIVE_WCF_D...', 'customPageAdd', Array)#2 /home/www/borntosurvive.de/wcf/lib/system/template/TemplateCompiler.class.php(30): wcf\system\template\TemplateScriptingCompiler->compileString('customPageAdd', '{include file='...', Array)#3 /home/www/borntosurvive.de/wcf/lib/system/template/TemplateEngine.class.php(461): wcf\system\template\TemplateCompiler->compile('customPageAdd', '{include file='...', '/home/www/bornt...', Array)#4 /home/www/borntosurvive.de/wcf/lib/system/template/TemplateEngine.class.php(317): wcf\system\template\TemplateEngine->compileTemplate('customPageAdd', '/home/www/bornt...', '/home/www/bornt...', Array)#5 /home/www/borntosurvive.de/wcf/lib/page/AbstractPage.class.php(305): wcf\system\template\TemplateEngine->display('customPageAdd', 'wcf')#6 /home/www/borntosurvive.de/wcf/lib/acp/form/CustomPageAddForm.class.php(327): wcf\page\AbstractPage->show()#7 /home/www/borntosurvive.de/wcf/lib/page/AbstractPage.class.php(100): wcf\acp\form\CustomPageAddForm->show()#8 /home/www/borntosurvive.de/wcf/lib/system/request/Request.class.php(58): wcf\page\AbstractPage->__run()#9 /home/www/borntosurvive.de/wcf/lib/system/request/RequestHandler.class.php(139): wcf\system\request\Request->execute()#10 /home/www/borntosurvive.de/acp/index.php(10): wcf\system\request\RequestHandler->handle('wbb', true)