One of the annoying issues with the spatial analysis tools in the arc toolbox, Spatial Analyst Tools/Hydrology is,” Image Server is not supported with the current license error.” as the following.
How to Fix This
This issue can be solved easily using the following:
disable the Parallel Processing feature(Parallel Processing should improve the processing speed by utilizing multiple cores that we have on a modern processor. But, for some reason, this is not happening)
To do that, open the process, eg.fill in this case.. Before press OK to run the process. Click Environments.Scroll down to the Parallel Processing section. Type 0 and press OK. Now the process should work.