ArcHydro in ArcGIS 10; error running longest flow path function.  Help!!

Discussion created by on Feb 17, 2011
Latest reply on Jun 27, 2013 by zye-esristaff
I keep getting this error message when I try to run the longest flow path tool using the newest ArcHydro extension in ArcGIS 10:

WARNING 010353: The environmental cell size is ignored
What does this mean??

I was able to make this tool work in ArcGIS 9.3!

Someone please help me!!!