Problem:
As the error description implies, this happens when you set the, numprocs to a value greater than 1.
e.g. numprocs=4
Solution:
Supervisor will start as many instances of this program as named by numprocs so you need to include %(process_num) in the value you for program_name so that process will have unique names.
e.g. process_name = %(program_name)s_%(process_num)02d
Now you can restart supervisor
