HI. pls help me . I tried to run the process from ArcToolbox, (using ArcHydro V.2.1.0.27 on a Windows 7, SP2 machine), but I received the following error. when I using hydro tools , this error go on . (always) "System.Runtime.InteropServices.COMException (0x80004005): Error HRESULT E_FAIL has been returned from a call to a COM component. at ESRI.ArcGIS.Geoprocessing.GeoProcessorClass.Execute(String Name, IVariantArray ipValues, ITrackCancel pTrackCancel) at ESRI.APWR.ApHydro.ArcHydroOp.SinkEvaluation(ApLayers apLayers, Double zUnitFactor, Int32 debug, ITrackCancel& trackcancel, IGPMessages& messages, String& exMessage) in C:\Builds\HydroSolutions\10.0_ArcHydro\Sources\ArcHydroTools\src\ApHydro\ArcHydroOp.vb:line 6337 Failed to execute (SinkEvaluation)." Thanks for your help. I'm going to try running out of ArcToolbox w/an older version of ArcHydro 2 and see if it runs successfully. ~ Stacie
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