diff --git a/examples/motion-track.js b/examples/motion-track.js
index fca53ba..4aa43f6 100644
--- a/examples/motion-track.js
+++ b/examples/motion-track.js
@@ -3,13 +3,13 @@ var cv = require('../lib/opencv')
 
 var vid = new cv.VideoCapture("/Users/peterbraden/Desktop/repos/node-opencv/examples/motion.avi")
 
-vid.read(function(mat){
+vid.read(function(err, mat){
   var track = new cv.TrackedObject(mat, [420, 110, 490, 170], {channel: "value"});
   var x = 0;
   var iter = function(){
     vid.read(function(m2){
       x++;
-      var rec = track.track(m2)
+      var rec = track.track(err, m2)
       console.log(">>", x, ":" , rec)
       if (x % 10 == 0){
         m2.rectangle([rec[0], rec[1]], [rec[2], rec[3]])