Make WisskiHelper a service

On which WissKI instance happened the incidence?

https://fed-sap.wisski.cloud/admin/reports/dblog/event/96

When does the issue occur?

Open /admin/config/wisski/ontology

What exactly lead to the behaviour?

e.g. "Error occur on /admin/config/wisski/ontology when I try to import the ontology". I entered the the url of the ontology (http://erlangen-crm.org/211015/) and clicked on "load ontology".

Just open the site and the form wants to load the service.

What happened instead? Did the page crash, is there an error or did the action not take place?

e.g. "The were two error messages: Something went wrong in 'doQuery' for adapter "default"; "Something went wrong in 'directUpdate' for adapter "default"

Get Error:

Error: Call to private Drupal\wisski_core\WisskiHelper::__construct() from scope Drupal\Component\DependencyInjection\Container in Drupal\Component\DependencyInjection\Container->createService() (line 259 of /var/www/data/project/web/core/lib/Drupal/Component/DependencyInjection/Container.php).