Got error 28 from storage engine
Is this on a fresh install of CMS builder, or has it started happening on a site that had been working previously? I've done some quick research into that error, it's coming from the MySQL server itself and usually happens when there isn't enough disk space remaining for MySQL to operate.
I'd recommend raising a support ticket with your hosting provider regarding the issue and asking them if they can resolve it, as I don't think its an error that's coming from CMS Builder itself.
Let me know if you have any additional questions.
PHP Programmer - interactivetools.com