Esri Terrain-Tools v1.1 Sky Tool Cannot Save File

SpatiallySpeaking

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I am trying to use Esri Terrain-Tools v1.1 to create a hillshade from either a 90 m SRTM DEM or 30 m DEM. I have tried saving this to a file geodatabase (FGDB) and .tif. In both cases the error reported is cannot save to "output format" GRID/TIFF

Traceback (most recent call last):&nbsp;&nbsp; File "C:\GIS_local\TOOLS\TerrainTools_v1_1\Scripts\SkyModel.py", line 81, in <module>&nbsp;&nbsp;&nbsp;&nbsp; skymodel(*args)&nbsp;&nbsp; File "C:\GIS_local\TOOLS\TerrainTools_v1_1\Scripts\SkyModel.py", line 63, in skymodel&nbsp;&nbsp;&nbsp;&nbsp; prevRaster.save(outRaster) RuntimeError: ERROR 010240: Could not save raster dataset to C:\GIS_local\hillshade\sky1.tif with output format TIFF.&nbsp; Failed to execute (SkyModel). Failed at Mon Feb 26 17:18:37 2018 (Elapsed Time: 3 hours 46 minutes 44 seconds)