What is IIS 7 Advanced Logging provider GUID? I can't raise event to it

Question

Hi, all:

I asked this in IIS.net forum but want to ask again here.

In my custom module, I want to raise event using Advanced Logging. I copied code from here http://www.ksingla.net/2009/04/using_advanced_logging_to_log_custom_module_data/

But no luck. In debugging, I find that pHttpTraceContext->RaiseTraceEvent( &Event ); always return

"0x80070015 The device is not ready. " in VS 2010.

What part is wrong? Thanks