Help: error when use Generate From/To Node for Lines

[YanliZhang]

I am using ArcHydro 10.1 for ArcGIS 10.1. When I try to use the Generate From/To Node for Lines, an error message pops up and I could not go further.  Any help would be greatly appreciated.
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[MarkBoucher]

See tips at http://forums.arcgis.com/threads/48100-ArcHydro-Problem-Solvers?p=270146&viewfull=1#post270146.