"deepstream-lpr-app 1 1 0 LPR.mp4 out.h264" gives "One element could not be created. Need 'nvinfer'. Exiting."

I found the right forum, "deepstream-lpr-app 1 1 0 LPR.mp4 out.h264" gives "One element could not be created. Exiting."

Please comment there.