Good evening Andrea and welcome to the Events Calendar forum!
Thank you for your interest in our products.
We’ll be glad to answer your questions.
You did not mention, but I take it that your calendar lives at: http://www.cracovia32.com/es/events/
I am not exactly sure how the URLs are set up, but what I do know is that your different views are missing the “es” slug in your view URLs somehow (e.g.: http://www.cracovia32.com/es/events/list/ vs http://www.cracovia32.com/events/list/ )
With that in mind, I would try the following suggestions: https://theeventscalendar.com/knowledgebase/fixing-http-404-errors/
Let me know if that helps.
Have a great day!
Geoff B.