错误“ConnectAsUserName未设置”但我甚至没有使用该属性

I'm using the Microsoft.SqlServer.Smo.dll version 9.0.1399.0 in my [NAnt] build process. I'm running on Windows Server 2008 R2. I'm connecting to BOTH Sql Server 2008 R2 (10.5) as well as Sql Server 2008 (10.0).I'm using the Microsoft.SqlServer.Smo.dll versi