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RVM reports gemfile ruby ​​as not installed

In my gemfile, I pointed out:

ruby '1.9.3', engine: 'jruby', engine_version: '1.7.9'

But entering my Rails project directory does rvmthrow this error:

RVM used your Gemfile for selecting Ruby, it is all fine - Heroku does that too,
you can ignore these warnings with 'rvm rvmrc warning ignore /home/petey/rails/kotoba/Gemfile'.
To ignore the warning for all files run 'rvm rvmrc warning ignore allGemfiles'.

ruby-1.9.3,engine:jruby,engine_version:1.7.9 is not installed.
To install do: 'rvm install ruby-1.9.3,engine:jruby,engine_version:1.7.9'

However, I have jruby 1.7.9 installed:

$ rvm list

rvm rubies

   jruby-1.7.9 [ x86_64 ]
   ruby-1.9.3-p392 [ x86_64 ]
=* ruby-2.0.0-p247 [ x86_64 ]

# => - current
# =* - current && default
#  * - default

$ rvm use jruby
Using /home/petey/.rvm/gems/jruby-1.7.9

$ ruby -v
jruby 1.7.9 (1.9.3p392) 2013-12-06 87b108a on OpenJDK 64-Bit Server VM 1.7.0_25-b30 [linux-amd64]

In fact, I can even select it with rvm use jruby, and the rails work fine.

Is there a problem with the ruby ​​directive in Gemfile?

I followed the official specification which has a very similar example.

Edit: At startup rvm install ruby-1.9.3,engine:jruby,engine_version:1.7.9, rvm proceeds to install ruby-1.9.3-p484. And again, it shows the same error message when entering the project directory:

RVM used your Gemfile for selecting Ruby, it is all fine - Heroku does that too,
you can ignore these warnings with 'rvm rvmrc warning ignore /home/petey/rails/kotoba/Gemfile'.
To ignore the warning for all files run 'rvm rvmrc warning ignore allGemfiles'.

ruby-1.9.3,engine:jruby,engine_version:1.7.9 is not installed.
To install do: 'rvm install ruby-1.9.3,engine:jruby,engine_version:1.7.9'
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:

RVM , , RVM.

:

#ruby=jruby-1.7.9

Gemfile ruby, rvm, , :

$ cd kotoba
RVM used your Gemfile for selecting Ruby, it is all fine - Heroku does that too,
you can ignore these warnings with 'rvm rvmrc warning ignore /home/petey/rails/kotoba/Gemfile'.
To ignore the warning for all files run 'rvm rvmrc warning ignore allGemfiles'.

$ ruby -v
jruby 1.7.9 (1.9.3p392) 2013-12-06 87b108a on OpenJDK 64-Bit Server VM 1.7.0_25-b30 [linux-amd64]
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