Problem solved: The simplest fix for this would be to re-install or re-enable the mod_php. If it’s on your system now, you can enable it using Webmin -> Servers -> Apache Webserver -> Configure Apache Modules.
I reinstalled:
shell Install mod_php:
apt-get install libapache2-mod-php5 a2enmod php
I enabled php5:
enable it using Webmin -> Servers -> Apache Webserver -> Configure Apache Modules. > php5
I restarted apache2:
restart it using Webmin -> System -> Bootup and Shutdown -> apache2 -> Restart