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I got it working removing ROS completely from my computer and re-installing it.

Seems like there was a mess of files and folders in my catkin and in opt, possibly from several trials and errors in a first contact with ROS,

Now it has compiled but i have a different problem, the rosserial connection doesn't work. I guess that is because of the arduino code written, as the rosserial works when using the HelloWorld example.

Thanks saleem for your answer.

I open another question with the actual state (where I solved the problem!)