I tried the fix that suggested to edit the /sapphire/_config.php file. That did NOT work.

I edited the /sapphire/thirdparty/Zend/Cache/Backend/File.php on line 90 and made it 'cache_dir' => './silverstripe-cache/',//null,

That works.

We have done another install of 2.4 - In previous versions, the cache was written to the root tmp directory of the server, and that can be hungry on resources. So we used to create a directory within the client site root called silverstripe-cache and it used to write the files into client individual sites

To achieve that now (cache directory in the client root), the core has be changed as above, and we dont think that is a good thing. Willr, was there a particular reason to change that?

thanks
peter

Version 2.4.0

We had to go back to the default install because there was a admin login issue

regards
Peter

@Spydo

is_dir() [function.is-dir]: open_basedir restriction in effect.

Means you cannot write the tmp files to /tmp/. To get around this issue create a 'silverstripe-cache' folder in your root folder and make sure the webserver has the correct permissions to read / write to the dir.