Error When pulling Triton Inference Server container version 19.10

I have installed Nvidia docker, and tried to pull the Triton Inference Server image by following the instruction from here [server/ at main · triton-inference-server/server · GitHub].

I first logged in to my NGC account and received the message “Login Succeeded” in the console.
Then I ran the command docker pull,
And received the error message “Error response from daemon: manifest for not found”.
I also tried pulling other container version of Triton Inference Server, like
docker pull and docker pull, which both worked perfectly fine.
But docker pull returned the same error as before.

Add up: The earliest version I can find on NGC is 20.03, I guess that’s why this error was generated. Then, how can I download version 19.10?