DeepStream

Hii,
I installed Deepstream SDK on my Jetson Nano by following the steps of Github repository. I am working on object detection model. While running the deepstream app, it is getting error. ** ERROR: main:675: Could not open X Display.
I am enclosing the screenshot of error which i got. Pease can anyone help me to sort out this error.
Thankyou in advance.

Duplicated with DeepStream SDK