Yes of courses!
Try removing the object repository word in your test object and run again.
the second is correct
In that case, test it with this corrected xpath:
$x("//input[@id='ctl0_CONTENU_PAGE_libelleFr']")
Thanks for noticing that @kazurayam 
Yes of courses!
Try removing the object repository word in your test object and run again.
the second is correct
In that case, test it with this corrected xpath:
$x("//input[@id='ctl0_CONTENU_PAGE_libelleFr']")
Thanks for noticing that @kazurayam 