Thank you. I flushed the cache and requested godaddy to exclude from the cahe the sitemap, now I have this error:
Fatal error: PLL_Model::_languages_list(): The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition "PLL_Language" of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide a __autoload() function to load the class definition in /home/content/p3nexnas03/30/2083530/html/wp-content/plugins/polylang/include/model.php on line 197
it looks related to polylang. I will check their plugin support.
Thanks.