SSL in Chrome browser show GA script is "insecure"

I installed Multisite Analytics for wp1euro.com

And after that I bought a SSL ceritifcate for this domain also, and Chrome show the red cross onto this domain, and when I checked in Javascript console, it show this:

The page at https://wp1euro.com/ ran insecure content from http://wp1euro.com/wp-content/plugins/google-analytics-async/ga-async.css?ver=3.4.1.

When I deactive Multisite Analytics plugin, it gone.

How can I do it? I sell service and I do not my customer get any doubt on me.

Thanks.