meaning of 'none' in the shell

Peter J Etheridge petergi@REDACTED
Tue Dec 1 03:42:22 CET 2020

Dear Fellow Erlangers,
This module used to run. I have broken it somehow.
Now I get;

What does 'none' mean in the shell?
Where should i be looking for my error?
Thank you in advance.
Happy programming to all,Peter

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