This can sometimes be an issue, but 95% of the time we find that regenerating a new key can solve this issue. Please follow the directions below.
- Make sure you have correctly added the plugin file to your server
- Make sure that after you added the file to your server, you restarted the server completely
- Make sure that you've added your server to your admin panel > minecraft tab
- Continue with the directions below
- Go to your admin panel > minecraft tab > servers tab
- If you haven't added your server yet, please do so
- If your server is added, you can view the key on this "servers" page
- You need to click "edit" -> "Generate Key"
- Copy the command EXACTLY as stated within the popup
- Visit your server console in-game and paste what was given to you