I installed this plugin (http://www.s2software.it/en/download/joomla-image-resize-cache) and I have this error, this error remains too after creating images/cache folder, on my server are available these: Imagick Shell Execute, JImage (GD) but no one want to work ...
And in System Information every folder, and file is writable, except configuraion.php
I find 2 temporary resolution:
First: in configuration settings > turn off the display errors
Second: libraries\joomla\filesystem\folder.php > find this: $obd = ini_get('open_basedir');
and put in comments like: //$obd = ini_get('open_basedir');