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My understanding of this error is that no Notifications Instances were found for the specified time. It would be interesting to know the values of start and end when the returned error refers 6/2/2016 10:18:39 AM.
On a more general note, there will be a major change to PI Notifications. The upcoming PI Notifications 2016 release that is currently available as a Beta, will be based on Event Frames. There's manual included with the Beta download with detailed descriptions of the new features. Please also check out the recording of PI Developers Club Webinar Series: What's new with PI Notifications 2016?
Thank you for your answer.