c# - Server startup error -

server start error when trying add purger timer ( game feature) seems server not allowed access?

purgetimer:

using system; using system.threading;  using system.collections.concurrent; using plus.habbohotel.gameclients; using plus.habbohotel.rooms;  namespace plus.habbohotel.minigames.purge {     /// <summary>     /// countdown before match starts     /// </summary>     public class purgetimer     {         /// <summary>         /// timer our operation         /// </summary>         private timer timer;          public bool on = false;          /// <summary>         /// constructor         /// </summary>         public purgetimer()         {             // method call when completed             timercallback timercallback = ticked;              // create new instance of timer             timer = new timer(timercallback, null, 30000, timeout.infinite);         }          /// <summary>         /// method call when timer finished         /// </summary>         /// <param name="info">the information</param>         public void ticked(object info)         {             try             {                  if (purgemanager.running)                 {                     foreach (gameclient client in plusenvironment.getgame().getclientmanager()._clients.values)                     {                         try                         {                             if (client == null)                             {                                 continue;                             }                              client.sendwhisper("[automatic event alert]: hotel under purge mode. crime legal.");                          }                         catch (exception e)                         {                          }                     }                      timer.change(30000, timeout.infinite);                 }                 else                 {                      return;                 }             }             catch { }         }     } } 

purgemanager:

    using system; using system.collections.generic; using system.linq; using system.text; using plus.habbohotel.minigames.purge; using system.threading.tasks;  namespace plus.habbohotel.minigames.purge {     public class purgemanager     {         public static purgetimer maintimer;         public static bool running;     } } 

error: http://prntscr.com/9ss0qb don't while it's not accessible!

firstly, please post error directly question, not linked image.

the error plus.habbohotel.gameclients.gameclientmanager._clients inaccessible due protection level seems pretty clear. naming convention used i'd take guess _clients collection private.