Deepstream-5.1/samples-deepstream-app: ** ERROR: Failed to parse config f

Here is my environment:
Device: Jetson Nano 2GB
Jetpack: L4T 32.5.1 [ JetPack 4.5.1 ]
Ubuntu 18.04.5 LTS
Kernel Version: 4.9.201-tegra
CUDA 10.2.89
CUDA Architecture: 5.3
OpenCV version: 4.1.1

Following Quickstart Guide, I prepared the Jetson device and installed the DeepStream SDK.

Install went through without any ERROR.

When I tries to Run deepstream-app (the reference application, using the following command

deepstream-app -c /opt/nvidia/deepstream/deepstream-5.1/samples/configs/deepstream-app

Here is the ERROR message I got:

** ERROR: <parse_config_file:532>: parse_config_file failed
** ERROR: main:627: Failed to parse config file ‘/opt/nvidia/deepstream/deepstream-5.1/samples/configs/deepstream-app’
App run failed

Other answers/discussions on this topic in this and other forums are of no use to me

Help me to fix this !!

This is how you must run
deepstream-app -c /opt/nvidia/deepstream/deepstream-5.1/samples/configs/deepstream-app/<config file>

Thank You !
with ‘source8_1080p_dec_infer-resnet_tracker_tiled_display_fp16_nano.txt’
it worked

deepstream-app -c /opt/nvidia/deepstream/deepstream-5.1/samples/configs/deepstream-app/source8_1080p_dec_infer-resnet_tracker_tiled_display_fp16_nano.txt

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