You need to fix the file permissions/ownership.
If you don't have permission to use chmod/chown, contact your server administrator. If you don't know your server administrator, contact your host. If you are hosting it, read this tutorial: http://www.firewall.cx/linux-knowledgebase-tutorials/introduction-to-linux/299-linux-file-folder-permissions.html
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"...public_html/cache$ sudo chown -R apache:root cache
We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:
#1) Respect the privacy of others.
#2) Think before you type.
#3) With great power comes great responsibility.
sudo: no tty present and no askpass program specified"
That's told me!