Run security_barrier_camera_demo error

Hi:

I use security_barrier_camera_demo to RUN 

has some error below 

My version is latest version  "l_openvino_toolkit_p_2019.1.144"

Edwin :~/inference_engine_samples_build/intel64/Release$ ./security_barrier_camera_demo -i /opt/intel/openvino/deployment_tools/demo/car_1.bmp -m /opt/intel/openvino/intel_models/
[ INFO ] InferenceEngine: 
    API version ............ 1.6
    Build .................. custom_releases/2019/R1.1_28dfbfdd28954c4dfd2f94403dd8dfc1f411038b
[ INFO ] Parsing input parameters
[ INFO ] Capturing video streams from the video files or loading images
[ INFO ] Files were added: 1
[ INFO ]     /opt/intel/openvino/deployment_tools/demo/car_1.bmp
[ INFO ] Number of input image files: 1
[ INFO ] Number of input video files: 0
[ INFO ] Number of input channels: 1
[ INFO ] Display resolution: 1920x1080
[ INFO ] Vehicle Attribs detection DISABLED
[ INFO ] License Plate Recognition detection DISABLED
[ INFO ] Loading plugin CPU

    API version ............ 1.6
    Build .................. 23780
    Description ....... MKLDNNPlugin
[ INFO ] Loading network files for VehicleDetection
[ ERROR ] Error loading xmlfile: /opt/intel/openvino/intel_models/, File was not found at line: 1 pos: 0

How should I do??

Thank you!