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ArgumentError: Malformed version number string Yarn v0.1.1 2011 Jesper Kjeldgaard
# console $ bin/rails webpacker:install rails aborted! ArgumentError: Malformed version number string Yarn v0.1.1 2011 Jesper Kjeldgaard /path/to/project/bin/rails:9:in `<top (required)>' /path/to/project/bin/spring:15:in `<top (required)>' bin/rails:3:in `load' bin/rails:3:in `<main>' Tasks: TOP => webpacker:install => webpacker:check_yarn (See full trace by running task with --trace)
brew upgrade yarn
That will either work or give you another error message to look up.
Too late to answer now but if someone else might stumble upon this question in future, in my case, below steps solved the above-mentioned error:
curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
sudo apt update && sudo apt install yarn
Hope this helps !!!