Hello all, I am having an issue when trying to run the fill sink took. I have attached a screenshot of the error I am getting in ArcMap. Is there a previous step that I am missing. I am also unable to open up the help on the Arc Hydro Tools 9 toolbar. I get a blank message box with an ok button. I am running Windows 7 Professional and ArcGIS 9.3.1. Any help would be much appreciated.
