warning:lib openflow _01 fields ignored due to unspecified prerequisites nw_src nw _dst

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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.

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Eric On

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

Please refer this link