function release_objects_by_section(find_string)  
  for a=1,65534 do  
  local obj = alife():object(a)  
  if obj then  
  if obj:section_name()~=nil and string.find(obj:section_name(),find_string) and obj.id~=nil then  
  local sect=obj:section_name()  
  alife():release(alife():object(obj.id),true)  
  end  
  end  
  end  
  end

[error]Description   : ...lishing\stalker3p\gamedata\scripts\xr_effects.script:1277: attempt to index global 'npc' (a nil value)

function jup_b43_unload_machine_tutor(actor, npc)
  destroy_object(actor, npc, {"story", "jup_b43_af_fuzz_kolobok"})

-- int mode:
-- 0 =  Undefined = закрыто
-- 1 =  Inventory
-- 2 =  Trade
-- 3 =  Upgrade
-- 4 =  DeadBodySearch
-- 10 =  Talk dialog  show
-- 11 =  Talk dialog  hide

C++ class callback {
      const action_animation = 21;
      const action_movement = 18;
      const action_object = 24;
      const action_particle = 23;
      const action_removed = 20;
      const action_sound = 22;
      const action_watch = 19;
      const actor_sleep = 25;
      const article_info = 12;
      const death = 8;
      const helicopter_on_hit = 27;
      const helicopter_on_point = 26;
      const hit = 16;
      const inventory_info = 11;
      const inventory_pda = 10;
      const level_border_enter = 7;
      const level_border_exit = 6;
      const map_location_added = 14;
      const on_item_drop = 29;
      const on_item_take = 28;
      const patrol_path_in_point = 9;
      const script_animation = 30;
      const sound = 17;
      const take_item_from_box = 34;
      const task_state = 13;
      const trade_perform_operation = 3;
      const trade_sell_buy_item = 2;
      const trade_start = 0;
      const trade_stop = 1;
      const trader_global_anim_request = 31;
      const trader_head_anim_request = 32;
      const trader_sound_end = 33;
      const use_object = 15;
      const weapon_no_ammo = 35;
      const zone_enter = 4;
      const zone_exit = 5;
        
};

const use_object = 15;

local callbacks={
   update={},
   game_load={},
   death={},
   npc_death={},
   monster_death={},
   offline_death={},
   net_spawn={},
   net_destroy={},
   info={},
   item_drop={},
   item_take={},
   item_take_from_box={},
   hit={},
   monster_hit={},
   npc_hit={},
   enemy_see_actor={},
   actor_see_enemy={},
   npc_shot_actor={},
   respawn={},
   use={},
   actor_destroy={},
   main_menu_on={},
   main_menu_off={}
}

use={},

self.object:set_callback(callback.use_object, nil)

self.object:set_callback(callback.use_object, generic_physics_binder.use_callback, self)

self.object:set_callback(callback.коллбек_из_lua_help, название_биндера.название_нового_метода_биндера, self)

function generic_physics_binder:use_callback(obj, who)
   if obj:clsid() == clsid.inventory_box then
    local box_name = obj:name()
--  treasure_manager.use_box(obj, who)
   end
   if self.st.active_section then
    xr_logic.issue_event(self.object, self.st[self.st.active_scheme], "use_callback", obj, who)
   end
end