Comments: Permissions
2 - Cache directory Permissions and Owner
The /app/tmp/ directory needs to have all those directories, because I don't think cake will create them manually, unless that's been changed in recent builds.
Rather than CHMOD it would probably be better to use CHOWN to change the user to the web server user. In my case it looks something like this:
chown -R wwwrun.www app/tmp

By peplau on 10/7/08
1 - /app/tmp
Version 1.2.0.7296-rc2 installation came with the /app/tmp filled by empty folders. Do I need to upload that folders to my host and CHMOD it ? or is it created by CakePHP while needed?