Simple php includes in header.php isn't working…

So I’m trying to add a simple php file include statement in my header.php file but include is not working… Here’s my code so far.

$themePath=get_template_directory_uri();
		$toolbarPath= "$themePath/comm_toolbar/toolbar_initialization.php";
		if (! include ($toolbarPath)){
			echo "No File included";

		}

My header always outputs no file included!
What obvious thing am I missing here?
Thanks for your help in advance.
-Alex