@SLaks is right about the error you are receiving.
I would like to add to that by showing you a better way to target IE:
<!-- paulirish.com/2008/conditional-stylesheets-vs-css-hacks-answer-neither/ -->
<!--[if lt IE 7 ]><html class="ie6" lang="en"><![endif]-->
<!--[if IE 7 ]><html class="ie7" lang="en"><![endif]-->
<!--[if IE 8 ]><html class="ie8" lang="en"><![endif]-->
<!--[if IE 9 ]><html class="ie9" lang="en"><![endif]-->
<!--[if IE 10 ]><html class="ie10" lang="en"><![endif]-->
<!--[if !IE ]><!--><html class="non-ie" lang="en"><!--<![endif]-->
The benefit of doing it this way is that you get to keep the best practice of only using 1 stylesheet. You simply preface your target with the corresponding IE class you want to hack.
For example: .ie6 #target-id
For a more in depth explanation, check out Paul Irish's article:
Conditional stylesheets vs CSS hacks? Answer: Neither!
lt IE 7will never match IE7!