Thank you very much for your attention, because this is really strange, because the web was really working well but I don't know what happened that overnight it doesn't work at all. I'm not saying it's from the thrirtybees code.
I'm just asking for help to see if I don't lose all the work I've done.
As I'm not an expert programmer, I don't understand what you mean, what happened is that as it didn't work well I recovered a backup from two days ago and installed it again including the database, but it still doesn't work.
Right now I don't remember if there was an update of plesk and/or some module of thirtybees too.