Error when trying to install ggbiplot

[riemu10]

I got PAT and installed "devtools", after that I entered install_github("vqv/ggbiplot") but error massage was displayed as follows.
Using github PAT from envvar GITHUB_PAT
Error: Failed to install 'unknown package' from GitHub:
HTTP error 401.
Bad credentials

I thought I needed to have more step to verify the PAT and I entered install_github(..., auth_token = "<PAT#>"), but error massage was displayed again.
I would like to use ggbiplot for my research. I appreciate it, If someone could give me the guidance for installation. Thank you.

[splaisan]

have a look here: James-Thorson-NOAA/VAST#147 (comment)
did the job for me