I’m developing a simple program which utilize EnvDTE to automatically attach to a process. I already got an EnvDTE object successfully but I cannot enumerate the Debugger5.Transports field. Code below worked yesterday but raises an exception now and after restarting Windows it still does not work.

var debugger = dte.Debugger as Debugger5;

var enumerator = debugger.Transports.Cast<Transport>().GetEnumerator();
var t = enumerator.MoveNext(); // <- Unhandled exception occurred

// COMException: (0x8002802B): Element not found. (0x8002802B (TYPE_E_ELEMENTNOTFOUND))

Is there any possible solution?
Thanks in advance.