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is it obligatory to have this repo in order to work with ur-robot-driver?

No, it isn't.

If you don't use it though, you'll end up with the default URDF, which means the kinematic calibration of your robot will not be taken into account with FK/IK queries.

i see that this parameter is new in the repo that i'm using....

exactly.

So in order for this to work, you should/could provide that parameter and then you'd be able to follow the tutorial you linked.