UV shifting script "leaks meshes" in editor

So, I'm using an edited version of a UV shifting script in order to shift UVs from within the editor. The idea is to use this script in order to recolour level features by shifting their UVs to other spots on an atlas containing many colour variations. The problem is the editor is telling me that I'm "leaking meshes" when using the script. Any ideas of how I could implement this differently in order to avoid the errors?

Here is the script:

 #pragma strict
 @script ExecuteInEditMode() 
 
 public var uOffset : float = 0.25f;
 public var vOffset : float = 0.25f;
 
 public var AddU : boolean = false;
 public var SubU : boolean = false;
 public var AddV : boolean = false;
 public var SubV : boolean = false;
 
 function Start()
 {
     this.enabled = false;
 }
 
     function Update()
     {
         if (AddU)
         {
             SetUVs(uOffset,0.0f);
             AddU = false;
         }
         if (SubU)
         {
             SetUVs(-uOffset,0.0f);
             SubU = false;
         }
         if (AddV)
         {
             SetUVs(0.0f,vOffset);
             AddV = false;
         }
         if (SubV)
         {
             SetUVs(0.0f,-vOffset);
             SubV = false;
         }
     }
 
 function SetUVs(u : float , v : float)
 {
     // Build the uvs 
     var uvs : Vector2[] = new Vector2[(GetComponent(MeshFilter) as MeshFilter).mesh.vertices.Length]; 
     uvs = (GetComponent(MeshFilter) as MeshFilter).mesh.uv; // Take the existing UVs 
 
 
     for (var i = 0 ; i < uvs.Length; i++) uvs[i] = Vector2 (uvs[i].x + u, uvs[i].y + v); // Offset all the UV's 
 
    // Apply the modded UV's 
     (GetComponent(MeshFilter) as MeshFilter).mesh.uv = uvs; 
 
 }