Problem solved. It was the nodebb-plugin-cash who caused the problem.
After deleting this plugin my NodeBB worked again 🙂
As of date is it the only option available? shared hosting still not possible?
Not unless the shared hosting provider gives you some command line access and will let you install nodejs, and run several npm commands. Plus they have to have MongoDB or Redis access for database. Most shared hosting providers don't have the software necessary for running nodebb, and they won't let you install it.