Processbook Error [-11101]

I have an issue in which I am looking at several PI points.  I am using the PIAdvCalcFilVal function.  I feed all the points the same filtering criteria.  A few of them come back with error [-11101] "All data events are filtered in the summary calculation".  I have also gone back and looked at each individual point and have verified that they all return a value during the time in question using the PIArcVal function.  Has anyone else ever encountered this?  If so, what was done to resolve this?

Thanks.

Michael Statler