C# ASP .Net Error ObjectDataSource could not find a non-generic method

My error:  ObjectDataSource 'dsGenre' could not find a non-generic method 'GetGenre' that has no parameters.


My code:
<asp:DropDownList runat="server" ID="genreList" style="float:left;" DataSourceID="dsGenre" DataTextField="Author_Name" DataValueField="title_id" />

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<asp:DropDownList runat="server" ID="genreList" style="float:left;" DataSourceID="dsGenre" DataTextField="Author_Name" DataValueField="title_id" />

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What is causing this error and how do I resolve it?
programmherAsked:
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Paul JacksonSoftware EngineerCommented:
You need to post the markup code for dsGenre and the method GetGenre so we can help further but basically the error says you are not specifying select parameters in the markup for dsgenre that the method GetGenre expects.
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