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The error indicates that the JSON file you are trying to load here:
with open("/etc/config.json") as config_file:
config = json.load(config_file)
is not correct JSON because of wrong quoting in line 4 of the JSON file (you probably use single instead of double quotes):
JSONDecodeError: Expecting property name enclosed in double quotes:
line 4 column 1 (char 71)
Source:stackexchange.com