[sumo-user] Beginner

[F M <fm66.electrical@xxxxxxxxx>]

Hello to everyone,

I am a very new sumo-user that I am following some tutorial examples in Sumo-documentation. What I have faced even in the simplest example as Hello world is that I cannot put the vehicle in on the road and when I try to put it writes 

Warning: Double edges aren't allowed.

Can anyone help me to solve this? It happens in the example of DrivinginCircles. It prevents running with this warning. Actually I cannot insert vehicles in my scenarios.

Thank you in advance.