Drupal Technical
[SOLVED][Drupal ImageCache] ImageCache Temp Directory /tmp is not writeable by the webserver.
ImageCache Temp Directory /tmp is not writeable by the webserver. If you are getting this error message when you check the status reports of your Drupal website then there is an easy fix for it. Read on to find out more.
This is more of a server write permissions issue rather than an issue of the Drupal ImageCache module.
The solution is simple. Go to admin/settings/file-system in your Drupal site and replace /tmp with just tmp (remove the preceding slash).
Hope that helps.
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Reference: http://drupal.org/node/482128