WCF异步调用在Main（）中抛出Target调用异常

I' developing a WCF client which makes Asynchronous calls to the WCF server. I'm using .NET 3.5 with Winforms. My original method is named GetPoints() and I'm using the GetPointsAsync() from the proxy generated by the visual studio 2010 to call the service. I' developing a WCF client which makes Asynchro