Accepting EULA
If you missed to accept Eula as true from starting a new server
here's some options solution for you:
Option 1: On your panel go to Files tab. At Files tab find the file named eula.txt then open it. You will see the content of the eula.txt then set the eula to true: (e.g. eula = false) then to (e.g. eula = true).
Option 2: On your panel go to Files tab. Create directory file named eula.txt then open the file. After that, open your "eula.txt" file and type "eula = true" then save content.
Then Restart your server.