Error running test-ms 3

[mikefarias]

For what reason is this error when I run ryu controller both in the older version with the latest version:
[old version]*

[new version]**

I believe that the problem must be related to the topology configuration in Mininet:
[old version]*

[new version]*

• Version without option of running examples in mininext
  ** Version with option of running examples in mininext

[mikefarias]

I managed to solve the problem of the latest version by opening the file etc/mongodb.conf and commenting on #bind_ip line = 127.0.0.1 and running the following commands:
sudo rm /var/lib/mongodb/mongod.lock
sudo service mongodb restart