Why give me an error on namespace mset{ public enum Corner {

link textusing UnityEngine; using System.Collections;

namespace mset{ public enum Corner { TopLeft, TopRight, BottomLeft, BottomRight }

 public class logo : MonoBehaviour {
     public Texture2D logoTexture = null;
     public Color color = Color.white;
     public Vector2 logoPixelOffset = new Vector2(0,0);
     public Vector2 logoPercentOffset = new Vector2(0,0);
     public Corner placement = Corner.BottomLeft;
     private Rect texRect = new Rect(0,0,0,0);
     
     void Reset() {
         logoTexture = Resources.Load("renderedLogo") as Texture2D;
     }
     
     void Start() {
     }
 
     void updateTexRect() {
         if( logoTexture ) {
             float tw = logoTexture.width;
             float th = logoTexture.height;
             float cw = 0f;
             float ch = 0f;
             if( this.GetComponent<Camera>() ) {
                 //check attached camera first
                 cw = GetComponent<Camera>().pixelWidth;
                 ch = GetComponent<Camera>().pixelHeight;
             } else if( Camera.main ) {
                 //use first camera tagged as MainCamera
                 cw = Camera.main.pixelWidth;
                 ch = Camera.main.pixelHeight;
             } else if( Camera.current ) {
                 //use currently active camera (mostly harmless)
                 //cw = Camera.current.pixelWidth;
                 //ch = Camera.current.pixelHeight;
             }
             float ox = logoPixelOffset.x + logoPercentOffset.x*cw*0.01f;
             float oy = logoPixelOffset.y + logoPercentOffset.y*ch*0.01f;
             
             switch(placement) {
             case Corner.TopLeft:
                 texRect.x = ox;
                 texRect.y = oy;
                 break;
             case Corner.TopRight:
                 texRect.x = cw - ox - tw;
                 texRect.y = oy;
                 break;
             case Corner.BottomLeft:
                 texRect.x = ox;
                 texRect.y = ch - oy - th;
                 break;
             case Corner.BottomRight:
                 texRect.x = cw - ox - tw;
                 texRect.y = ch - oy - th;
                 break;
             };
             texRect.width = tw;
             texRect.height = th;
         }
     }
     
     void OnGUI() {
         updateTexRect();
         if( logoTexture ) {
             GUI.color = color;
             GUI.DrawTexture(texRect, logoTexture);
         }
     }
 }

}