连接WCF出现错误：The server was unable to process the request due to an internal

连接WCF时出现如下错误信息：
The server was unable to process the request due to an internal error.  For more information about the error, either turn on IncludeExceptionDetailInFaults (either from ServiceBehaviorAttribute or from the configuration behavior) on the server in order to send the exception information back to the client, or turn on tracing as per the Microsoft .NET Framework 3.0 SDK documentation and inspect the server trace logs.

由于内部错误，无法处理请求。

解决办法 ：

添加如下代码到服务类：

[ServiceBehavior(IncludeExceptionDetailInFaults = true)]

编译运行，问题解决！