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System.ArgumentException

Item has already been added. Key in dictionary: "var" Key being added: "var"

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Item has already been added. Key in dictionary: "var" Key being added: "var" 

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at System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean
add)
at System.Collections.Hashtable.Add(Object key, Object value)
at SAS.Shared.Parameters.ParameterList.AddOrdered(String key)
at SAS.Shared.Parameters.ParameterList.Add(Object key, Object value)
at SAS.Shared.Parameters.ParameterList.Add(Parameter parm)
at SAS.Shared.Parameters.ParameterList.ParameterChanged(Parameter parm,String oldName)
at SAS.EG.ProjectElements.ProjectParameterCollection.ParameterChanged(Parameter parm, String oldName)
at SAS.EG.Controls.Parameters.MacroManager.EditSelectedParameter()
at SAS.EG.Controls.Parameters.MacroManager.btnEdit_Click(Object sender,EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)System.ArgumentException

Item has already been added. Key in dictionary: "var" Key being added: "var"

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