Hey, I have taken a look and you have this issue because your directory permissions are all wrong. 95% are unwritable. The module cant save the cache images because its not allowed by your settings. Check this page in your admin to see for yourself
http://demo2.ultimateit.co.th/administr ... ew=sysinfo
You can try fixing this through ftp and manually changing permissions for all the folders, or if you are able to change the necessary ones then run Akeeba AdminTools you can fix permissions with that extension quickly.
I can help if you send me ftp