Error after moving site

[Naldinho]

Warning  tempnam(); open_basedir restriction in effect. File(/tmp) is not within the allowed path(s):

 

Fatal error: Class 'Tools' not found in

 

 

I've checked and tool.php is in classes

 

I've tried chmod -R 755 public_html 

 

The site originally showed the maintenance page and I was able to go to the back office and enable the site after which I pressed my site in the backoffice and got the homepage.

 

Now I can't get backoffice or homepage. Just 500 error.