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Traceback (most recent call last):  
    File "/usr/local/bin/ipython2.7", line 11, in <module>    
    sys.exit(start_ipython())  
    File "/usr/local/lib/python2.7/dist-packages/IPython/__init__.py", line 119, in start_ipython    
    return launch_new_instance(argv=argv, **kwargs)  
    File "/usr/local/lib/python2.7/dist-packages/traitlets/config/application.py", line 595, in launch_instance    
    app.initialize(argv)  File "<decorator-gen-111>", line 2, in initialize  
    File "/usr/local/lib/python2.7/dist-packages/traitlets/config/application.py", line 74, in catch_config_error    
    return method(app, *args, **kwargs)  
    File "/usr/local/lib/python2.7/dist-packages/IPython/terminal/ipapp.py", line 306, in initialize    
    self.init_shell()  File "/usr/local/lib/python2.7/dist-packages/IPython/terminal/ipapp.py", line 322, in init_shell    
    ipython_dir=self.ipython_dir, user_ns=self.user_ns)  File "/usr/local/lib/python2.7/dist-packages/traitlets/config/configurable.py", line 412, in instance    
    inst = cls(*args, **kwargs)  
    File "/usr/local/lib/python2.7/dist-packages/IPython/core/interactiveshell.py", line 465, in __init__    
    self.init_history()  File "/usr/local/lib/python2.7/dist-packages/IPython/core/interactiveshell.py", line 1586, in init_history    
    self.history_manager = HistoryManager(shell=self, parent=self)  
    File "/usr/local/lib/python2.7/dist-packages/IPython/core/history.py", line 520, in __init__    
    self.log.error("Failed to create history session in %s. History will not be saved."
    ,AttributeError: 'HistoryManager' object has no attribute 'log'