Hi
The geometry file create by matisse is not sufficient to run a telemac simulation.
With it you can create a telemac project in fudaa (that allow you to automatically create the boundary condition file and the steering file which are the minimum to run a telemac simulation).
If you try to run directly from dos command windows, you should be sure that these 3 files already exist in your directory.
To well understand the way to run telemac, please try with the training exemples.
Regards