rvm doesn't like jruby

command

[14:31:30]~/git/bma-calabash (CAL-2855_Try_JRuby)$ cd ..
[14:32:00]~/git$ cd bma-calabash
ruby-2.3.3,:engine=>jruby,:engine_version=>9.1.11.0-SNAPSHOT is not installed.
To install do: 'rvm install ruby-2.3.3,:engine=>jruby,:engine_version=>9.1.11.0-SNAPSHOT'
[14:32:03]~/git/bma-calabash (CAL-2855_Try_JRuby)$ rvm install 'ruby-2.3.3,:engine=>jruby,:engine_version=>9.1.11.0-SNAPSHOT'
Unknown ruby interpreter version (do not know how to handle): :engine=>jruby.
Unknown ruby interpreter version (do not know how to handle): :engine_version=>9.1.11.0-SNAPSHOT.
Already installed ruby-2.3.3.
To reinstall use:

    rvm reinstall ruby-2.3.3

[14:32:14]~/git/bma-calabash (CAL-2855_Try_JRuby)$ head Gemfile
# rubocop:disable Style/FileName
source 'https://rubygems.org'
#ruby '2.3.3', :engine => 'jruby', :engine_version => '9.1.12.0'
ruby '2.3.3', :engine => 'jruby', :engine_version => '9.1.11.0-SNAPSHOT'
# jruby 9.1.12.0 (2.3.3) 2017-06-15 33c6439 Java HotSpot(TM) 64-Bit Server VM 25.112-b16 on 1.8.0_112-b16 +jit [darwin-x86_64]