Cannot Run DeepStream 5.1

I am trying to download DeepStream Software Development Kit (SDK) on my Jetson Nano kit 4 GB. I followed this manual guide using Method#2 and I did everything as instructed. However, when trying to run “deepstream-app -c” command, I could not. It gives me this error:
gutech@gutechdesktop:/opt/nvidia/deepstream/deepstream-5.1/sources/apps/sample_apps$ deepstream-app -c dstest1_pgie_config.txt
-bash: /usr/bin/deepstream-app: cannot execute binary file: Exec format error

what does this error say? what I am doing here incorrectly?

see this screenshot:

Can you do this?
file /usr/bin/deepstream-app

I did the command you suggested; however, it keeps redirecting me to other symbolic links.(see the screenshot below)

What does it mean tho? did I install it in the wrong directory? or maybe I have missed some of the prerequisites?

I see you run on NANO, but the file is for x86-64 platform, you used wrong package, please install with aarch64 version.

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