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ArgumentError: Malformed version number string Yarn v0.1.1 2011 Jesper Kjeldgaard

Cloud asked in Ruby
I have webpacker gem and yarn gem.. and I'm stuck with this error: (help please :))
# 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)

Lets deal with the first problem first, that version of Yarn is pretty old.  The current version is v1.7.0.
If you installed it with brew update it with: 
brew upgrade yarn

That will either work or give you another error message to look up.
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