Ryu controller: OSLO package issue

Hi,

I recently faced an issue with Ryu SDN controller framework.  The error was:

ImportError: No module named oslo.config.cfg

And solved by doing (in the root directory of Ryu to upgrade the controller):

# pip2 install --upgrade ryu

I’m not sure, but I guess it was a deprecated version of OSLO package that was installed on my system or, maybe, the version of OSLO package that I had was superior than Ryu 3.21 needed (API’s parameters or names might have changed).

That’s all,

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