I have suffered these two days to make my pve server, when i use server.pve true i got damage when i hit some one and I do not care about this,I care when I hit scientists and murders i got damage too like they were other players because i setup reward system to my server so players want to get points from them, and i used TRUEPVE and it does not change anything

help please, I do not need to hit players and only I want to hit scientists and murders and they can damage too.
 ty

Using the TruePVE plugin

  "RuleSets": [
    {
      "name": "default",
      "enabled": true,
      "defaultAllowDamage": false,
      "flags": "HumanNPCDamage, LockedBoxesImmortal, LockedDoorsImmortal",
      "rules": [
        "anything can hurt dispensers",
        "anything can hurt players",
        "players cannot hurt players",
        "anything can hurt traps",
        "traps can hurt players",
        "players can hurt barricades",
        "barricades can hurt players",
		"npcs can hurt players",
        "highwalls can hurt players",
        "anything can hurt heli",
        "anything can hurt npcs",
        "fire can hurt players",
        "anything can hurt resources"
      ]
    }​

thank you @ElDubyaOZ for answer but, I did and still get damage reflect from players and building

Make 

server.pve false

first, then use the plugin.

i did and server.pve false then use the plugin and i can kill players

Well it works fine for me doing it exactly that way. Do you have any other plugins installed? 

yes i have other plugins but not for pvp, now i find plugin DamageControl i use it and work fine for players and buildings and murderer and bad for scientist and heli that u not take any damage from any bullets

can you send to me TruePVE.json please.