New Post: Error occur when create CustomTaskPane

[ComVisible(true)]
[COMAddin("Test", "Test Excel插件", 3), RegistryLocation(RegistrySaveLocation.CurrentUser)]
[GuidAttribute("9C1865C9-8E2F-43C4-8594-97599D4E8012"), ProgId("Test.ExcelAddin")]
public class MyAddin : NetOffice.ExcelApi.Tools.COMAddin
{
    public MyAddin()
    {
    }

    public override void CTPFactoryAvailable(object CTPFactoryInst)
    {
        try
        {
            TaskPaneFactory = new ICTPFactory(this.Application, CTPFactoryInst);
            _CustomTaskPane target = this.TaskPaneFactory.CreateCTP(typeof(MyUserControl).FullName, "Test");
            Console.WriteLine(target);
        }
        catch (Exception e)
        {
            MessageBox.Show(e.Message);
        }
    }
}

[ComVisible(true)]
public partial class MyUserControl : UserControl
{