Update app.py

app.py

@@ -173,7 +173,7 @@ def step3_uv_map(state):
 def step4_track(state):
     session_id = state.get("session_id")
     base_conf.video_name = f'{session_id}'
-    tracker = Tracker(base_conf, flame_model, diff_renderer)
+    tracker = Tracker(base_conf, flame_model)
     tracker.run()
 
     tracking_dir = os.path.join(os.environ["PIXEL3DMM_TRACKING_OUTPUT"], session_id, "frames")