Installation problem

I made the installation and this error message appeared and I already gave the 777 folder permission, can you help me?

The site is currently offline due to encountering an error. If the problem persists, please contact the system administrator.
System administrators, check server logs for errors.

Thanks,
Eduardo

why i can’t update mautic
update database eror like this

Downloading Package Success
Extracting Package Success
Moving Package Contents Success
Clearing Application Cache Success
Processing Database Updates Failed

can anybody help me?

thank