Commented Unassigned: System.Collections.Generic.KeyNotFoundException [27525]

This error come after using July 2013 release:

例外狀況資訊:
例外狀況型別: System.Collections.Generic.KeyNotFoundException
例外狀況訊息: The given key was not present in the dictionary.

執行緒資訊:
堆疊追蹤: 於 System.ThrowHelper.ThrowKeyNotFoundException()
於 System.Collections.Generic.Dictionary`2.get_Item(TKey key)
於 AjaxControlToolkit.TabContainer.LoadClientState(String clientState)
於 AjaxControlToolkit.ScriptControlBase.LoadPostData(String postDataKey, NameValueCollection postCollection)
於 AjaxControlToolkit.TabContainer.LoadPostData(String postDataKey, NameValueCollection postCollection)
於 AjaxControlToolkit.ScriptControlBase.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection)
於 System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad)
於 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
Comments: Would you please provide a sample project?