I installed your plugin on my blog (which is using Thesis theme) & it gives the following error:

Trailing slash check required.

It looks like your blog has URLs that end with a ‘/’. Unfortunately since you installed this plugin a duplicate content bug has been found where URLs not ending in a ‘/’ end serve the same content as those with the ‘/’ and do not redirect to the proper URL.To fix, you must edit your .htaccess file and add these two rules to the two groups of Super Cache rules:

RewriteCond %{REQUEST_URI} !^.*[^/] %{REQUEST_URI} !^.*//.*$

Please advice.