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This question has been asked previously and I have tried everything given in the answers but still getting the same warning. I am using code in this link (lab4.py & lab4_controller.py). I am creating a separate file of topology in /mininet/examples and trying to access the switches using pox controller from another terminal but getting the above warning.

Songy
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Debapriya Sen
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    You should post your code here, links can change over time and the question would become useless. – ZygD Jun 10 '15 at 10:34

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this warning means that you did just specified higher layer parameter without lower parameter specified first.

Please refer this link

Eric
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