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ReOssync修改版发布，欢迎下载测试 /home/oss/ossync/sdk/oss_util.py:10: DeprecationWarning: the md5 module is deprecated; use hashlib instead   import md5 Traceback (most recent call last):   File '/home/oss/ossync.py', line 26, in     from queue_thread import QueueThread   File '/home/oss/queue_thread.py', line 29, in     from config.setting import *   File '/home/oss/config/setting.py', line 45, in     LOGFILE_PATH = os.path.join(os.path.dirname(os.path.abspath(__file__)), '../', 'logs/app.log') NameError: name 'os' is not defined 出现这样的提示，请问是什么原因呢