Image must writable error

[firepro20]

../images must writable! is being displayed on the php page

This is the line of code which I believe is giving the problem

$cached_src_one = $imagecache->cache( '../images/background.jpg' );

I am running the php page from where the images folder is found.

[RockDaFox]

Hello !
Same bug, any ideas ?
My folder is under chmod 777...

[JansonWong]

Please note below directory:
dirname(FILE) . '/images/cached'
You need to have those folders