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I am using imagecache Drupal module to develop an image gallery. Everything worked fine in my local machine, but when uploading contents to my webserver some errors appeared when creating a new gallery:

an image thumbail was not able to be created

The solution is quite simple:

chmod 0777 /sites/default/files/imagefield_thumbs
chmod 0777 /sites/default/files/imagefield_default_images
chmod 0777 /httpdocs/sites/default/files/imagecache

and also

chmod 0777 /httpdocs/sites/default/files/imagecache/*

Check that your temp directory is writable too.

If the tips above won’t work, make sure you have GD Support enabled in your server (check it using phpinfo())

If you are not able to solve this, check this post.

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