@HansieNL: Sure. I checked it agrees. The beta version only solves part of the problems. Many problems are caused by the configuration of 'Apache2', support for headers and permissions.

Hello everyone on the forum
I use Debian 9 Raspbian Stretch. I made a new installation.

You must use apache for the calendar and garbage to work!
Part1 :

sudo apt-get install apache2 apache2-doc apache2-utils php7.0-zip
sudo apt-get install libapache2-mod-php7.0 php7.0 php7.0-opcache php7.0 ...