Yes I understand. I copied what you commented and I paste it into whitelist.json. I restarted the server and did /whitelist on. I still got the "not implemented" message on the console. I did this many times to make sure I did not do anything wrong.
I did an edit to the thread and added 2 pictures showing that I copied your comment and pasted it into the whitelist.json. I also took a screenshot of the console when I activated whitelist.
I did something extra aswell. When the whitelist.json was empty and I restarted server. There was only 1 word written in the whitelist.json and it was "null".
I added a picture of the console
Hello, the white-list=true fixed it!
The issue was that I put a number "1" instead of true. Thats why it did not work at all. Im sorry. This is not a bug. This was an issue with server.pro. Once again, this is my faulth. Thank you for all your help