I installed it from 
https://github.com/osrg/ryu/wiki/OpenFlow_Tutorial

I tried your suggestion but it's incorrect 

Any suggestion ??!!

Best,
Talal

On Mar 13, 2015, at 6:11 PM, YAMAMOTO Takashi <[email protected]> wrote:

>> How to fix this ?
>> 
>> 
>> /ryu# ./bin/ryu-manager ryu/app/simple_switch.py
>> Traceback (most recent call last):
>>  File "./bin/ryu-manager", line 18, in <module>
>>    from ryu.cmd.manager import main
>> ImportError: No module named ryu.cmd.manager
> 
> looks like an installation problem.
> how did you installed ryu?
> 
> if '/ryu' is a copy of the source tree,
> "PYTHONPATH=. ./bin/ryu-manager ryu.app.simple_switch"
> might work.
> 
> YAMAMOTO Takashi
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