WBBLite 2.0.x Problem mit Login ACP

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Fatal error: PHP warning in file /users/triple-cena/www/board/wcf/lib/system/event/EventHandler.class.php (73): get_class() expects parameter 1 to be object, string given

Information:

error message: PHP warning in file /users/triple-cena/www/board/wcf/lib/system/event/EventHandler.class.php (73): get_class() expects parameter 1 to be object, string given
error code: 0
file: /users/triple-cena/www/board/wcf/lib/system/WCF.class.php (255)
php version: 5.3.0
wcf version: 1.0.10 (Horizon)
date: Sat, 25 Jul 2009 11:37:20 +0000
request: /board/acp/index.php?form=Login
referer: [URL]http://triple-cena.bplaced.net/board/acp/index.php?form=Login&packageID=24&s=b63e6d9c66c175fb2aa942b5a8378d0132e3d8f1[/URL]
Stacktrace:

#0 [internal function]: WCF::handleError(2, 'get_class() exp...', '/users/triple-c...', 73, Array)
#1 /users/triple-cena/www/board/wcf/lib/system/event/EventHandler.class.php(73): get_class('UserAuth')
#2 /users/triple-cena/www/board/wcf/lib/system/event/EventHandler.class.php(142): EventHandler::executeInheritedActions('UserAuth', 'loadInstance', 'UserAuth', 'loadInstance@Us...')
#3 /users/triple-cena/www/board/wcf/lib/system/auth/UserAuth.class.php(28): EventHandler::fireAction('UserAuth', 'loadInstance')
#4 /users/triple-cena/www/board/wcf/lib/acp/form/LoginForm.class.php(56): UserAuth::getInstance()
#5 /users/triple-cena/www/board/wcf/lib/acp/form/LoginForm.class.php(74): LoginForm->validateUser()
#6 /users/triple-cena/www/board/wcf/lib/form/AbstractForm.class.php(41): LoginForm->validate()
#7 /users/triple-cena/www/board/wcf/lib/form/AbstractForm.class.php(88): AbstractForm->submit()
#8 /users/triple-cena/www/board/wcf/lib/acp/form/LoginForm.class.php(103): AbstractForm->readData()
#9 /users/triple-cena/www/board/wcf/lib/page/AbstractPage.class.php(74): LoginForm->readData()
#10 /users/triple-cena/www/board/wcf/lib/page/AbstractPage.class.php(36): AbstractPage->show()
#11 /users/triple-cena/www/board/wcf/lib/acp/form/LoginForm.class.php(30): AbstractPage->__construct()
#12 /users/triple-cena/www/board/wcf/lib/util/RequestHandler.class.php(63): LoginForm->__construct()
#13 /users/triple-cena/www/board/wcf/lib/util/RequestHandler.class.php(94): RequestHandler->__construct('Login', Array, 'form')
#14 /users/triple-cena/www/board/acp/index.php(8): RequestHandler::handle(Array)
#15 {main}