对 COM 组件的调用返回了错误 HRESULT E_FAIL

 webconfig中检查有无突显节
<compilation debug="true">
        <assemblies>
          <add assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
        </assemblies>
      </compilation>