TypeError: Error #2007 Parameter type must be non-null

Question

I have this problem :

TypeError: Error #2007: Parameter type must be non-null. at flash.events::EventDispatcher/addEventListener() at Ch05_02()

when I am running my flash doc the Ch05_02 as file

package {
   import it.gotoandplay.smartfoxserver.SmartFoxClient;
   import it.gotoandplay.smartfoxserver.SFSEvent;
   import it.gotoandplay.smartfoxserver.SFSEvent.onJoinRoom;
   import it.gotoandplay.smartfoxserver.data.Room;
   import it.gotoandplay.smartfoxserver.data.User;
   import flash.display.*;

   public class Ch05_02 extends MovieClip{
      private var _sfs:SmartFoxClient;
      private var _avatarList:Array = new Array();

      public function Ch05_02() {
         _sfs = new SmartFoxClient(true);
         _sfs.addEventListener(SFSEvent.CONNECTION, onConnection);
         _sfs.addEventListener(SFSEvent.ROOM_JOIN, onJoinRoom);
         _sfs.addEventListener(SFSEvent.USER_ENTER_ROOM, onUserEnterRoom);
         _sfs.addEventListener(SFSEvent.USER_EXIT_ROOM, onUserLeaveRoom);
         _sfs.connect("127.0.0.1",9339);
      }

      private function onConnection(e:SFSEvent):void
      {
         var ok:Boolean = e.params.success;
         if (ok){
            _sfs.login("simpleChat","myname","");
         }
      }

      private function onRoomListUpdate(e:SFSEvent):void
      {
         _sfs.autoJoin();
      }
   }
}

Come on put some efforts! At least start debugger and check the line with the error.... — Andrey Popov
Well this means that your _sfs is null, which is strange. Just play along with the debugger and check WHICH one is null and you will find the answer. Simply point over to the variable.. — Andrey Popov

Marcela Marcela · Accepted Answer · 2014-05-07T19:18:11

Looking at the documentation for SmartFox, it appears that you have the event names wrong. That's why the compiler is complaining about the type parameter being null. SFSEvent.CONNECTION, SFSEvent.ROOM_JOIN, et al do not exist and are therefore null.

You'll want to use the correct event names. SFSEvent.onConnection, SFSEvent.onJoinRoom, etc.

TypeError: Error #2007 Parameter type must be non-null

1 Answers