How can i run ORB_SLAM2 on ros indigo

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I have a turtlebot with ros indigo and kinect2. I am want to run example RGB_D Node of ORB_SLAM2, but terminal show some following errors to me.

$ rosrun ORB_SLAM2 RGBD Vocabulary/ORBvoc.txt ROSbag/kinect2_conf.yaml

ORB-SLAM2 Copyright (C) 2014-2016 Raul Mur-Artal, University of Zaragoza.
This program comes with ABSOLUTELY NO WARRANTY;
This is free software, and you are welcome to redistribute it
under certain conditions. See LICENSE.txt.

Input sensor was set to: RGB-D
Failed to open settings file at: ROSbag/kinect2_conf.yaml

what shuld i do?