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I'm encountering a similar error with my data, any solutions out there or is this another highly specialized set of tools that only works with tutorial data???
After that post (seems a long time ago) I managed to do what I needed with "stream definition" and gave up of this "flow direction with streams". I'm dealing with large files (10,000 km2, around 3,000 watersheds) and these "highly speacialized tools", as you mentioned, with very little help, are actually a problem. I believe they have been created to help in complex situations, but we certainly would need to know more about the tools before we could make good use of them, beyond the tutorials. ESRI should give more attention to this before selling expensive licences, as if the ArcGIS was ready for use in highly complex projects. I don't think it is. And some senior GIS technologists in the forum seems to agree with me. If you have time, read the "Delineation of bridges and culverts Watersheds (advanced problems)" in the hydro forum (I've put this same post in different fora and got different answers, all of them very helpfull!) I'm sorry that anything I'm saying is going to help you to solve your specific problem, but maybe it can help you finding other ways to deal with ArcGIS highly specialized tools. I've had success doing so, although I feel that the past 5 months of work could have been done in 5 weeks or less, if ArcGIS/ArcHydro were better finished softwares, with better help files. Good luck!