SharePoint Designer 2010 Javascript errors Sys.InvalidOperationException

Message: Sys.InvalidOperationException: Type SP.UI.DialogResult has already been registered. The type may be defined multiple times or the script file that defines it may have already been loaded.

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My workflow: I tried to open a dialog by clicking a button so I used SP.UI.ModalDialog
However when the page loaded, the error occurred.
<asp:Content ID="PageHead" ContentPlaceHolderID="PlaceHolderAdditionalPageHead" runat="server">
    <link href="../Stylesheet.css" rel="stylesheet" type="text/css" />
    <script src="SP.UI.Dialog.js" type="text/javascript"></script>
</asp:Content>

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I am using SharePoint 2010, Visual Studio 2010.
Thank you very much.
zhshqzycAsked:
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Jamie McAllister MVPConnect With a Mentor SharePoint ConsultantCommented:
I suspect that the Dialog JS is already registered in the masterpage, and when you try to register it with your own code you're getting this exception. Keep the masterpage reference and remove your reference to get rid of the error.
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zhshqzycAuthor Commented:
Many thanks.
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