Apche configuration error after removeing passenger + nginx_proxy

Hi folks,
after removing passenger and nginx reverse proxy from my plesk 12.5 installation non of the apache conf is working.
Apache seems to work fine. Status OK. No errors in /var/log/apache2/error.log
I tried /usr/local/psa/admin/sbin/httpdmng --reconfigure-all with no luck

Any suggestions ?