Error with ArcHydro: HRESULT E_FAIL has been returned from a call do a COM component

[GiovanniMaccioni1]

Hi everyone,
When running Stream definition with ArcHydro I get this error message:

[ATTACH=CONFIG]21600[/ATTACH]

I've already tried to remove ArcHydro and install it again but I still get that error message.

Any help very much appreciated.

Regards,

Giovanni

[GiovanniMaccioni1]

I solved the problem upgrading to ArcGIS 10.1 and installing the beta version of ArcHydro for 10.1

Giovanni