AttributeError: 'str' object has no attribute 'decode'

[yacchin1205]

In python 3, cannot load the server extensions

[W 2017-05-27 07:15:22.467 yazawa notebookapp:1279] Error loading server extension nblineage
    Traceback (most recent call last):
      File "/opt/conda/lib/python3.5/site-packages/traitlets/traitlets.py", line 528, in get
        value = obj._trait_values[self.name]
    KeyError: 'server_signature'
    
    During handling of the above exception, another exception occurred:
    
    Traceback (most recent call last):
      File "/opt/conda/lib/python3.5/site-packages/notebook/notebookapp.py", line 1274, in init_server_extensions
        func(self)
      File "/opt/conda/lib/python3.5/site-packages/nblineage/__init__.py", line 24, in load_jupyter_server_extension
        sign_uuid = tracking_server.server_signature
      File "/opt/conda/lib/python3.5/site-packages/traitlets/traitlets.py", line 556, in __get__
        return self.get(obj, cls)
      File "/opt/conda/lib/python3.5/site-packages/traitlets/traitlets.py", line 535, in get
        value = self._validate(obj, dynamic_default())
      File "/opt/conda/lib/python3.5/site-packages/nblineage/tracking_server.py", line 56, in _server_signature_default
        sign_id = str(uuid1()).decode('utf-8')
    AttributeError: 'str' object has no attribute 'decode'