怎么一直报一个people的错误

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Traceback (most recent call last): File "/usr/local/bin/json2mantle", line 9, in load_entry_point('JSON2Mantle==0.0.9', 'console_scripts', 'json2mantle')() File "/Library/Python/2.7/site-packages/json2mantle/cli.py", line 263, in main j2m = JSON2Mantle() File "/Library/Python/2.7/site-packages/json2mantle/cli.py", line 32, in init 'author': utils.get_current_user_name(), File "/Library/Python/2.7/site-packages/json2mantle/utils.py", line 63, in get_current_user_name people = address_book.people() AttributeError: 'NoneType' object has no attribute 'people'