Area Solar Radiation : Unable to set analysis window

[RachaelHoover1]

Hi! I am running Area Solar Radiation and keep encountering two errors 

1: Error 010327: Unable to set analysis window

2: Error 010067: Error in executing grid expression

I have clipped my DEM to be smaller to test if the size was too larger. In environments I have set the processing extent to the input raster extent. I have also set the cell size in Raster Analysis to be equal to the raster cell size. 

Any other ideas on how to solve this issue?

[RachaelHoover1]

I should also clarify that I am using arcmap 10.8. I have made sure that the workspace I am writing too is valid and that I have write permissions.