'thickboxL10n' is undefined Error in IE fomr W3 Total cache

Hello,

I have the W3 Total Cache plugin installed on a site I am developing http://www.lucyryderwebprint.co.uk/test

In IE8 (maybe other versions too) I am getting an error message that says:

‘thickboxL10n’ is undefined
3a2dba3c.eeebbf.js – Line 94
Code: 0
URI – points to wp-content/w3tc/min/3a2dba3c.eeebbf.js
– I have no idea what this means, i have changed the settings when i installed the plugin but am clueless about what actually uses a JS file??

Am looking in the directory and can’t even see a file called ‘3a2dba3c.eeebbf.js’ – there’s only an index.php file in the min folder!!

Any help would be massively appreciated!

Thanks
Lucy