Can't find ai-cache

Hello,

I am trying to use your plugin on this website http://osushicambridge.bitnamiapp.com/ using an EC2 lamp stak but I can’t figure out how to make it work.

I did update my .htaccess but the website is still not responsive. I could not find the ai-cache folder in the upload folder so I created one but it is still not working. Do I need to chmod something for the plugin to create the ai-cache folder somewhere?

Cheers,
Mathias

http://wordpress.org/extend/plugins/new-nine-adaptive-images/