Got a OAuth Unauthorized Exception from twitter

[Torben Brodt]

error message: Got a OAuth Unauthorized Exception from twitter:
error code: 0
file: /var/www/clients/client1/web1/web/wcf/lib/data/twitter/Twitter.class.php (61)
php version: 5.2.6-3ubuntu4.6
wcf version: 1.1.6 pl 3 (Tempest)
date: Mon, 16 May 2011 15:47:56 +0000
request: /index.php?form=UserLogin&oauth_token=L7Qi4MUljS7jjClwdcjtAYNtT44AypfyJh3JSDH21lM&oauth_verifier=vQqaI4K6BT93lBHRUWVg5fjLYHLk4OaTaHPRZ6XRJwc
referer:
Stacktrace:
 
#0 /var/www/clients/client1/web1/web/wcf/lib/util/TwitterUtil.class.php(263): Twitter->startSession()
#1 /var/www/clients/client1/web1/web/wcf/lib/system/event/listener/UserLoginTwitterListener.class.php(40): TwitterUtil::loginOrRegister(Object(UserLoginForm))
#2 /var/www/clients/client1/web1/web/wcf/lib/system/event/EventHandler.class.php(207): UserLoginTwitterListener->execute(Object(UserLoginForm), 'UserLoginForm', 'readData')
#3 /var/www/clients/client1/web1/web/wcf/lib/page/AbstractPage.class.php(65): EventHandler::fireAction(Object(UserLoginForm), 'readData')
#4 /var/www/clients/client1/web1/web/wcf/lib/form/AbstractForm.class.php(93): AbstractPage->readData()
#5 /var/www/clients/client1/web1/web/wcf/lib/acp/form/LoginForm.class.php(105): AbstractForm->readData()
#6 /var/www/clients/client1/web1/web/wcf/lib/form/UserLoginForm.class.php(88): LoginForm->readData()
#7 /var/www/clients/client1/web1/web/wcf/lib/page/AbstractPage.class.php(90): UserLoginForm->readData()
#8 /var/www/clients/client1/web1/web/wcf/lib/page/AbstractPage.class.php(46): AbstractPage->show()
#9 /var/www/clients/client1/web1/web/wcf/lib/acp/form/LoginForm.class.php(32): AbstractPage->__construct()
#10 /var/www/clients/client1/web1/web/wcf/lib/util/RequestHandler.class.php(64): LoginForm->__construct()
#11 /var/www/clients/client1/web1/web/wcf/lib/util/RequestHandler.class.php(95): RequestHandler->__construct('UserLogin', Array, 'form')
#12 /var/www/clients/client1/web1/web/index.php(8): RequestHandler::handle(Array)
#13 {main}