Reason: after MAC is upgraded to MacOS Big Sur system version 11.1, the old version of homebrew is not suitable for the new system, and the message “in ` initialize ‘: version value must be a string” is sent; Got a nilclass() error
Solution:
just update to the latest version of homebrew
$ brew update-reset
Check the version again, OK
$ brew --version
Homebrew 3.1.5-101-gd3013fc
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