Hello,

I had used a simulation code in ryu, but,  when I uninstalled and then 
installed it again I got this error
Does anyone know how to fix it ?


File "/usr/local/bin/ryu-manager", line 9, in <module>
   load_entry_point('ryu==3.29', 'console_scripts', 'ryu-manager')()
File "/usr/local/lib/python2.7/dist-packages/ryu/cmd/manager.py", line 89, in 
main
   contexts = app_mgr.create_contexts()
File "/usr/local/lib/python2.7/dist-packages/ryu/base/app_manager.py", line 
429, in create_contexts
   context = self._instantiate(None, cls)
File "/usr/local/lib/python2.7/dist-packages/ryu/base/app_manager.py", line 
481, in _instantiate
   app = cls(*args, **kwargs)
File "/home/mininet/spider/src/SPIDER_ctrl.py", line 55, in __init__
   self.mn_topo = SPIDER_parser.networkx_to_mininet_topo(self.G, self.hosts, 
self.switches, self.mapping)
File "/home/mininet/spider/src/SPIDER_parser.py", line 311, in 
networkx_to_mininet_topo
   nodes = set(fnss_topo.nodes_iter())
AttributeError: 'Topology' object has no attribute 'nodes_iter'

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