Trying the kitchen command again, and I am still getting error messages

    $ kitchen converge
    -----> Starting Kitchen (v1.3.1)
    -----> Creating <default-ubuntu-1204>...
           Bringing machine 'default' up with 'virtualbox' provider...
           The following berks command failed to execute:

               /Users/antkong/.rvm/gems/ruby-2.2.0/bin/berks --version --format json

           The stdout and stderr are shown below:

I probably have installed chefdk when the system ruby is active.

So rvm use system works for me