[enrique]

A couple of things to check:

In the code, make sure your speed controller declarations match the speed controllers your using. (Victor, Jaguar)

Make sure the digital side car shows 3 green lights in the area that shows 5v.
If it does not then your missing the digital side car power.

Make sure the side car cable is tight on both sides.

Make sure the modules are in the correct slot.

If you tried the above then try a new side car.
If still having problems then try changing the actual module.