--- a/graphics.sty	Mon Nov 16 15:16:26 2015 +0000
+++ b/graphics.sty	Tue Nov 17 01:58:50 2015 +0000
@@ -6,6 +6,7 @@
 \usetikzlibrary{arrows}
 \usetikzlibrary{backgrounds}
 \usetikzlibrary{fit}
+\usepackage{tikz-qtree}
 \usepackage{graphicx} 
 \usepackage{pgfplots}