Expected class,delegate, enum, interface or struct

using System;
using System.Collections.Generic;

using Sce.PlayStation.Core;
using Sce.PlayStation.Core.Environment;
using Sce.PlayStation.Core.Graphics;
using Sce.PlayStation.Core.Input;
using Sce.PlayStation.Core.Audio;
using System.Linq;
namespace Game2
{
	public class AppMain
	{
		private static GraphicsContext graphics;
		private static Texture2D BG;
		private static Player hero, hero2;
		private static Sprite back, back2;
		private static Vector3 pos1,pos2,pos3,pos4,pos5,pos6,pos7,pos8,pos9;
		private static bool running;
		private static BgmPlayer bgmp;
		private static List<Bullet> bullets;
		private static List<Enemy> eList;
		private static List<Player> pList;
		
		
		
		
		
		public static void Main (string[] args)
		{
			Initialize ();

			while (running) {
				SystemEvents.CheckEvents ();
				Update ();
				Render ();
				
			
			}
		}

		public static void Initialize ()
		{
			// Set up the graphics system
			graphics = new GraphicsContext ();
			
			//sets the position of the two players
			pos1=new Vector3(100,400,0);
			pos2=new Vector3(500,400,0);
			pos3=new Vector3(100,100,0);
			pos4=new Vector3(160,100,0);
			pos5=new Vector3(220,100,0);
			pos6=new Vector3(280,100,0);
			pos7=new Vector3(340,100,0);
			pos8=new Vector3(400,100,0);
			pos9= new Vector3(460,100,0);
			
			
		
			
			
			
			
			
			
			running=true;
			
			//creates two object of the Player class and an object of the Enemy class
			pList= new List<Player>();
			hero = new Player (1,graphics,pos2);
			hero2 = new Player (2,graphics,pos1);
			pList.Add (hero);
			pList.Add (hero2);
			
			eList= new List<Enemy>();
			Enemy e1=new Enemy(graphics,pos3,0.1);
			eList.Add(e1);
			Enemy e2=new Enemy(graphics,pos4,0.2);
			eList.Add(e2);
			Enemy e3=new Enemy(graphics,pos5,0.3);
			eList.Add(e3);
			Enemy e4=new Enemy(graphics,pos6,0.4);
			eList.Add(e4);
			Enemy e5=new Enemy(graphics,pos7,0.5);
			eList.Add(e5);
			Enemy e6=new Enemy(graphics,pos8,0.6);
			eList.Add(e6);
			Enemy e7=new Enemy(graphics,pos9,0.7);
			eList.Add(e7);
			
			
			bullets = new List<Bullet>();
			
			
			
			
			
			
			//processes the background and sets the position
			
		
			BG = new Texture2D ("/Application/Assets/Bckgd.png", false);
			
			back = new Sprite (graphics, BG);
			
			back.Position.X = 0;
			
			back.Position.Y = 0;
			
			back2 = new Sprite (graphics, BG);
			
			back2.Position.X = 0;
			
			back2.Position.Y = back.Height;
			
			Bgm bgm =  new Bgm("/Application/Assets/song.mp3");
			bgmp = bgm.CreatePlayer();
			bgmp.Loop=true;
			bgmp.Play();
			
			
			
			
			
		
			
			
			
			
			
			
		
			
			
			
	
		}

		public static void Update ()
		{
			// Query gamepad for current state
			var gamePadData = GamePad.GetData (0);
			//Updates the the two objects of the Player Class and the Enemy Class
			
			
			
			if ((gamePadData.Buttons & GamePadButtons.Select) !=0)
			{
				running=false;
			}
		}
			
			private static void PlayerReg()
		{
		foreach(Player k in pList)
			{
				k.Update(gamePadData);
			}
		}
		
		private static void EnemReg()
		{
		foreach(Enemy z in eList){
				z.Update();
			}
		}
		private static void BulletReg()
		{
		foreach(Bullet b in bullets)
			{
			b.Update();
			}
		
		
			
			//Bullets
			BulletReg();
			EnemReg();
			PlayerReg();
			
			
			
			
			//vertically scrolls the background
			back.Position.Y--;
			
			back2.Position.Y--;
			
			if (back.Position.Y < -back.Height)
				back.Position.Y = back.Height;
			if (back2.Position.Y <= -back2.Height)
				back2.Position.Y = back2.Height;
 				
			//Bullets
			
			
			if ((gamePadData.Buttons & GamePadButtons.L) !=0)
			{
				Bullet b= new Bullet(graphics,hero.Pos);
				
				bullets.Add (b);
			}
			
			if ((gamePadData.Buttons & GamePadButtons.R) !=0)
			{
				Bullet b= new Bullet(graphics,hero2.Pos);
				bullets.Add(b);
			}
		}
		
		
	}
}

		

		
		
		
		
		
		public static void Render ()
		{
			// Clear the screen
			graphics.SetClearColor (0.0f, 0.0f, 0.0f, 0.0f);
			graphics.Clear ();
			
			//draws the sprites to the screen
			back.Render ();
			
			back2.Render ();
			
			foreach(Player k in pList){
				k.Render();
			}
			
			foreach(Enemy z in eList){
				z.Render();
			}
			
			foreach(Bullet b in bullets){
				b.Render();
			}
			
			
			
			//bULLETS
			foreach(Bullet b in bullets)
			{
			b.Render();
					
			}
			// Present the screen
			graphics.SwapBuffers ();
		
		public static void collisions()
		{
			for(int k=pList.Count-1;k>=0;k--)
			{
			 for(int b=bullets.Count-1;b>=0;b--)
				{
			if (Vector3.Distance (pList[k].Center, bullets [b].Center) < pList[k].Radius+bullets [b].Radius)
					{
						bullets.RemoveAt(b);
						break;
						
					}
				}
	        }
	
			
		}
		public void Collisions2()
		{
			for(int k=pList.Count-1;k>=0;k--)
			{
				for(int z=eList.Count-1;z>=0;z--)
				{
			if (Vector3.Distance(pList[k].Center, eList[z].Center)< pList[k].Radius+eList[z].Radius)
					   {
						eList.RemoveAt(z);
						pList.RemoveAt(k);
						break;
					}
					}
}}}}