In the ESRI lesson Identify an Ecological Niche for African Buffalo | Learn ArcGIS, on number 7 - 15 of the step "Add Watershed Data," it asks to copy the raster World Population Estimate 2016 after making some changes to the Environment of the rasters. I changed the cell size to 928 as the lesson says to. It does not work for this particular raster but does work for the other ones. I've attached a SS of the error.
I'm sorry for this problem. I haven't identified the issue yet, but in the meantime, you should be able to continue with the lesson by using the World Population Estimated 2015 imagery layer instead.
