Hi Fernando,
Thanks for getting in touch and we’d be happy to help you here. But first, do you have an active premium support license with us? I noticed that this thread is posted in our Pre-Sales forum and that you did not log in when posting it. Please let me know if that’s the case.
If you do not have a premium license, please do feel free to hit us up in our open source forum, which we hit once a week.
It sounds like your host has run out of memory and needs to allocate more of it to PHP. The WordPress Codex has info that might be able to help you here, but you may need to contact your host directly to increase the amount.
Cheers!
Geoff