An unhandled exception of type 'System.InvalidOperationException' occurred in system.xml.dll

Additional information: There was an error reflecting type 'Cherry.CherryLabels.Labels'.

public class LabelsCollection : CollectionBase
	{		
		#region Public methods	
		
		public Label this[int Index]
		{
			get{return (Label) this.InnerList[Index];}
			set{this.InnerList[Index] = (object) value;}
		}

		public int Count
		{
			get{return base.Count;}
		}

		public void Add(Label label)
		{
			InnerList.Add((object) label);
		}

		#endregion
	}

Additional information: There was an error generating the XML document.