I try to calculate slope data. This is the DEM source https://www.earthenv.org/DEM
Firstly, I translate data with gdal.Warp according to image UTM zone. Original image .bil extension so first I convert to tif and then reproject the image. You can see gdalinfo of this image in below.
I try to calculate in Jupyter notebook. gdal.DEMProcessing(dest,source,"slope") I get "ValueError: Received a NULL pointer." I try with the same input image in command line and Qgis Slope tool, everything is fine. What I miss it?