Installation bug

[JackqqWang]

I am following the link to install
https://mmclassification.readthedocs.io/en/dev-1.x/get_started.html#install-from-source
However, I met an error as below:

My environment is:
Python 3.9.7
NAME="Ubuntu"
VERSION="20.04.5 LTS (Focal Fossa)"
May I ask what could fix it?
Thanks

[Ezra-Yu]

you can go on installation and verify the installation refer to doc. Is there any error?