Ahrg! Plesk shows error after error....

[wbm78]

Hi all,

i tried a few minutes before to change some firewall rules on my Plesk System (on Debian). While activation the rulez i got the error "fWrite() fails" ..and now i have everwhere in plesk errors. I can login but while working with it i get errors like:
WEB_Server_package parameter not defined in features list.
0: /opt/psa/admin/plib/class.WebServerManager.php:201 psaerror()
1: /opt/psa/admin/plib/class.ServiceControl.php:86 WebServerManager->getWebServerPackage()
2: /opt/psa/admin/plib/class.ServiceControl.php:259 ServiceControl->chkServiceObjects()
3: /opt/psa/admin/plib/class.RestartServForm.php:86 ServiceControl->getServiceName()
4: /opt/psa/admin/htdocs/server/restart_services.php:42 RestartServForm->assign()

What happend? Please Help!