[pox-dev] L2 and L3 calling from another

[Amer]

Hello,


I want to create a handle packetin method, if the incoming packet is from 
specific switch run l2 if it from another run l3
What I did

from pox.forearding.l2_multi import *

def H_P (event):
   p = event.parsed
   If (p.dpid == "1"):
     sw= Switch()
     sw._handle_PacketIn(event)
   Else:
      #. L3.learning

I have received this error:
NoneType object has no Len()

Pox.py l2l3 openflow.discovery

Any help is appreciated

Best regards,
Amer