networkx AttributeError: 'DiGraph' object has no attribute 'edge'

[root@kunpeng82 Ryu-SDN-IP]# pip3 show networkx
Name: networkx
Version: 2.4
Summary: Python package for creating and manipulating graphs and networks
Home-page: http://networkx.github.io/
Author: Aric Hagberg
Author-email: hagberg@lanl.gov
License: BSD
Location: /usr/local/lib/python3.6/site-packages
Requires: decorator
[root@kunpeng82 Ryu-SDN-IP]# pip3 install -I ‘networkx==1.11‘
WARNING: Running pip install with root privileges is generally not a good idea. Try `pip3 install --user` instead.
Collecting networkx==1.11

[root@kunpeng82 Ryu-SDN-IP]# pip3 install --upgrade  networkx==1.11
WARNING: Running pip install with root privileges is generally not a good idea. Try `pip3 install --user` instead.
Collecting networkx==1.11
  Using cached https://files.pythonhosted.org/packages/d3/2c/e473e54afc9fae58dfa97066ef6709a7e35a1dd1c28c5a3842989322be00/networkx-1.11-py2.py3-none-any.whl
Requirement already up-to-date: decorator>=3.4.0 in /usr/local/lib/python3.6/site-packages (from networkx==1.11)
Installing collected packages: networkx
  Found existing installation: networkx 2.4
    Uninstalling networkx-2.4:
      Successfully uninstalled networkx-2.4
Successfully installed networkx-1.11
[root@kunpeng82 Ryu-SDN-IP]# pip3 show networkx
Name: networkx
Version: 1.11
Summary: Python package for creating and manipulating graphs and networks
Home-page: http://networkx.github.io/
Author: NetworkX Developers
Author-email: networkx-discuss@googlegroups.com
License: BSD
Location: /usr/local/lib/python3.6/site-packages
Requires: decorator
[root@kunpeng82 Ryu-SDN-IP]#