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Hi Juan,
Please try searching first as this has been asked many many times before, here are a couple of the results:
https://xoops.org/modules/newbb/viewtopic.php?topic_id=40749&viewmode=flat&order=ASC&start=0
https://xoops.org/modules/newbb/viewtopic.php?topic_id=27689&forum=27&post_id=120436#forumpost120280