Hi,

It may be trivial, I just started to work on RYU.
I downloaded RYU, additional tools( paramiko,ncc,lxml) and Mininet.
I started my mininet terminal and it works perfectly fine( setting switch,
hosts and controller)
When I ran first application given on Writing Your Ryu Application
<https://ryu.readthedocs.io/en/latest/developing.html>.

from ryu.base import app_manager
class L2Switch(app_manager.RyuApp):
    def __init__(self, *args, **kwargs):
        super(L2Switch, self).__init__(*args, **kwargs)

### after that I ran

ryu-manager ~/l2.py

It throws an error.

​
​how can i fix the error: no file or directory /var/log/ryu/ryu.log
Is it related to installation or do I need to write a log file.

Thanks!
Tony.
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