I also tested with MySQLi and MySQL (PDO). Both didn't function

FYI, When i just call the component with the right URL it does work
iebiezaa.voorbeeldvanuwwebsite.nl/admini...p?option=com_booking
But the menu is not created

I had this issue on a Mac with AMPPS installed localy, so i moved the website to my Linux webserver and tested it again.
Also on this webserver it is not functioning.
I can provide you with credentials if you want, but i don't think it's wise to put those on this forum.

I have attached a screenshot (in English this time)

The server has PHP7.1.1

When i try to install Artio Booking 2 on a Joomla! v3.8.2 website i get the following message:

Joomla\CMS\Table\Menu::_getNode(1, ) failed.

I am willing to buy the full version, but want to try the software first. When i can't install it the right way i have to look for an alternative. I think the only issue is that the menu-items aren't created the right way.

I don't have any filters applied, but when i try to apply filters, it's still not working.

Why should you use a sepparate table 'jos_vminvoice_status' while there's a table available from Virtuemart. There could only be trouble or confusion if users change the order status in Virtuemart.

I just bought vminvoices, installed it, but now i don't see any orders in de order list. I checked in virtuemart, but there are orders there. Please help me.