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Sample Eventdrv does not work when added to a custom WPR provider

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I compiled the WDK 8.1 EventDrv sample and followed the directions. Everything is working, and I can get a kernel trace and a trace from this provider, merge them, and see the appropriate event data. I created a WPR profile including this provider and it loads into the WPR GUI fine.  I set strict=true on the custom provider I added.  Traces including the profile will start when the driver is not loaded, but I don't get any events from it after loading and exercising it, post trace start. When the driver is loaded and I try to start the trace, I get 0xc558300c which I can't find anything out about on the web. Any idea what this error means or what I might be doing wrong? Has anyone got this working with the sample?

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