Can't run the "Chat with a Local CLI" example: exit status 127 with error output: failed to run: ERROR:

[deepnodes]

Followed the steps https://docs.gptscript.ai/examples/cli

1. Add the new file:

vi cli-demo.gpt

Then, input the contents listed in the doc.

2. Then run:

gptscript cli-demo.gpt

It shows error in the output:

run encountered an error: ERROR: The following is the help text for the gh cli and some of its sub-commands. Use these when figuring out how to construct new commands. Note that the --search flag is used for filtering and sorting as well; there is no dedicated --sort flag.
: exit status 127 with error output: failed to run: ERROR: The following is the help text for the gh cli and some of its sub-commands. Use these when figuring out how to construct new commands. Note that the --search flag is used for filtering and sorting as well; there is no dedicated --sort flag.
: exit status 127

From the output, I can see the echo part already works, but I don't know what is the exit 127 means?

How can I fix this issue and run the "Chat with a Local CLI" example?

Thanks