[Plugin: PageView] Error Get a better browser! .

I have the new theme mystique in my computer and at the home post I have the microcode from this plug-in.

The home post shows this error on the screen: Get a better browser!

I have IE8, Firefox and Safari for PC and it shows this error in all browsers.

When I change theme to default it works fine.

What trigers this error in the home post?

http://wordpress.org/extend/plugins/pageview/