Hi Graça,
Do you already checked in Service Center if you have any kind of error related with that module?
Just for curiosity, if you try to "Open in Brower" option in Service studio, do you have any problem?
By the way, it's traditional or reactive (and if traditional, what is the platform version)?
If traditional, do you have any kind of SEO rule applied?
Best regards,
Ricardo M Pereira