or
We are using version 2013.1.403.40 for Telerik.Web.UI.DLL.
System.ArgumentException: Invalid object passed in, ':' or '}' expected. (130): {"Top":0,"Left":0,"DockZoneID":"DashBoardZone2","Collapsed":false,"Pinned":false,"Resizable":false,"Closed":false,"Width":"300px", at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeDictionary(Int32 depth) at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeInternal(Int32 depth) at System.Web.Script.Serialization.JavaScriptObjectDeserializer.BasicDeserialize(String input, Int32 depthLimit, JavaScriptSerializer serializer) at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize(JavaScriptSerializer serializer, String input, Type type, Int32 depthLimit) at Telerik.Web.UI.RadWebControl.LoadPostData(String postDataKey, NameValueCollection postCollection) at System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)Time: 5/9/2013 4:03:36 PMSource: System.Web.Extensions<td><telerik:RadComboBox ID="cboAccount" runat="server" DataTextField="AccountName"DataValueField="AccountID" EnableLoadOnDemand="True" EmptyMessage="Select Account"MarkFirstMatch="True"OnSelectedIndexChanged="cboAccount_SelectedIndexChanged"AutoPostBack="True" ></telerik:RadComboBox> <asp:RequiredFieldValidator ID="ValidateAccount" runat="server"ControlToValidate="cboAccount" ErrorMessage="Please select a value"></asp:RequiredFieldValidator> </td>