ORB_SLAM failure on indigo ubuntu14.04

[szuer2017]

Hello ,
I just follow the Raulmur's Readme STEPS ,and When I launch ORB-SLAM from the terminal by "rosrun ORB_SLAM ORB_SLAM PATH_TO_VOCABULARY PATH_TO_SETTINGS_FILE",There will be a mistake - [ERROR] [1438841720.919284826]: Wrong path to settings. Path must be absolut or relative to ORB_SLAM package directory .
ps：I have provided the path of ORB_SLAM directory to the environment variable

I have thought the problem at version of opencv or others else ...
Thx for giving the answer .