Have you done point 6) of the HOWTO? It seems 'area' is not defined ...
6) Environment variables
Pytroll/SatPy is mainly looking for two environment variables:
# Path and name of wavelet decompression tool xRITDecompress.exe
This is only used if you want Satpy to handle decompression. This was not
available when I started my scripts. I set the path directly in the code.
# In this directory you manage your own configuration files locally. This is
really recommended if you begin to experiment with your own map projections.
These are defined in file areas.yaml where I added e.g. cyprus, isleofman, ..
The original default files are found under the lengthy path (don't change those!):
Environment variables can be added/set for your user account by "googling" bottom left for "ENV".
Then you permanently add the variable name and variable value to your personal environment only.
(**DO NOT CHANGE OR DELETE OTHER ENVIRONMENT VARIABLES AND DO NOT TOUCH THE SYSTEM VARIABLES**.)
Of course they can also be set at the command prompt after opening a black Miniconda3 window:
As long as the black Miniconda3 window stays open, this environment variable is now known.
Finally they can be set easily in batch files before the Python scripts are invoked: