ryu

OSError: Path does not exist or is not directory: '/usr/lib/python3/dist-packages/ryu/app/gui_topology/html/' Question: I was trying to open RYU topology viewer. I created a tree topology using these commands: user@ubuntu:~$ sudo mn –topo tree,3 –controller remote [sudo] password for user: *** Creating network *** Adding controller Unable to contact the remote controller at 127.0.0.1:6653 Unable to contact …