Homebrew fails on MacOS Big Sur

Question

I upgraded from Mohave to Big Sur and found that homebrew is not working any more. I installed the command line tools using the command

xcode-select --install 

After I run brew list, I get the following error

~ brew list Traceback (most recent call last):     11: from /usr/local/Homebrew/Library/Homebrew/brew.rb:23:in `<main>'     10: from /usr/local/Homebrew/Library/Homebrew/brew.rb:23:in `require_relative'      9: from /usr/local/Homebrew/Library/Homebrew/global.rb:37:in `<top (required)>'      8: from /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'      7: from /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'      6: from /usr/local/Homebrew/Library/Homebrew/os.rb:3:in `<top (required)>'      5: from /usr/local/Homebrew/Library/Homebrew/os.rb:21:in `<module:OS>'      4: from /usr/local/Homebrew/Library/Homebrew/os/mac.rb:58:in `prerelease?'      3: from /usr/local/Homebrew/Library/Homebrew/os/mac.rb:24:in `version'      2: from /usr/local/Homebrew/Library/Homebrew/os/mac.rb:24:in `new'      1: from /usr/local/Homebrew/Library/Homebrew/os/mac/version.rb:26:in `initialize' /usr/local/Homebrew/Library/Homebrew/version.rb:368:in `initialize': Version value must be a string; got a NilClass () (TypeError) 

I tried by deleting the folder /Library/Developer/CommandLineTools and installing the Command Line Tools for Xcode 12.3 beta but still I am getting the same error. Is there any way to make brew work?

Answer 1

You should update brew;

brew update-reset 

Answer 2

I had the same problem. Try upgrading brew - this solved it for me.

brew upgrade