Aledark

See attachment but the serverconfig.json should have the defined suplayer role in the serverconfig.json of your server
such as:
  {
      "Code": "suplayer",
      "Name": "Survival Player",
      "Description": "Can use/place/break blocks in unprotected areas (priv level 0), create/manage player groups and chat. Can claim an area of up to 8 chunks.",
      "PrivilegeLevel": 0,
      "DefaultSpawn": null,
      "ForcedSpawn": null,
      "Privileges": [
        "controlplayergroups",
        "manageplayergroups",
        "chat",
        "areamodify",
        "build",
        "useblock",
        "attackcreatures",
        "attackplayers"
      ],
      "RuntimePrivileges": [],
      "DefaultGameMode": 1,
      "Color": "White",
      "LandClaimAllowance": 262144,
      "LandClaimMinSize": {
        "X": 5,
        "Y": 5,
        "Z": 5
      },
      "LandClaimMaxAreas": 3,
      "AutoGrant": false
    },
serverconfig.json

/entity removebyid [entityid]
Used to remove one specific entity. Find the entity id by using ".clientConfig showEntityDebuginfo". Useful for removing a specific trader permanently, for instance.