[Napst34]

Sorry try this

Code:

 public OnPlayerSpawn(playerid)
{
  if(IsPlayerNPC(playerid))
  {
    new npc[MAX_PLAYER_NAME];
    GetPlayerName(playerid, npc, sizeof(npc)); 
    if(!strcmp(npc, "Attack_NPC", true))
    {
      SetTimer("AttackNPC", 5000, 0);
    }
    return 1;
  }
  return 1;
}

But for the CreateAttackingNPC, I don't really understand what you want to do if the player is an npc and the npcname is Attack_NPC ^^