You are not supposed to run sumo-launchd.py.
In your veins folder is a bin folder, that contains veins_launchd.
You can either run it with a parameter mentioning your SUMO path or you can edit the .profile in your omnet folder (if I remember correctly). After having edited the .profile you can run veins_launchd via:
./veins_launchd -vv
without having to mention the SUMO path every time.
Please look up the Veins tutorial.