无法添加类型。。的重复集合

<buildProviders>
            <add extension=".edmx" type="System.Data.Entity.Design.AspNet.EntityDesignerBuildProvider" />
            <add extension=".rdlc" type="Microsoft.Reporting.RdlBuildProvider, Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
        </buildProviders>![图片说明](https://img-ask.csdn.net/upload/201703/10/1489093959_847272.jpg)

 <add extension=".edmx" type="System.Data.Entity.Design.AspNet.EntityDesignerBuildProvider" />
前面加上
<remove extension="edmx"/>