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Failing to add ruby version :((

Hi!
I'm very new to powerline and json. Trying to learn how to customize the prompt theme.
I eager to start playing with customization of my prompt but ll my attempts failed so far(((
I want to add ruby version with rbenv to my right prompt.

Could you be more detailed to which file should I add all the stuff, mentioned in Readme...

I've added to /powerline/config-files/themes/powerline.json:

"version": {
    "before": "ⓔ  "
},

Added to /powerline/config-files/themes/shell/custom.json:

{
    "module": "powerlinex.segment.rbenv",
    "name": "version"
},

And included my custom.json theme to config.json:

"shell": {
            "colorscheme": "default",
            "theme": "custom",
            "local_themes": {
                "continuation": "continuation",
                "select": "select"
            }
        },

But instead of Ruby version in the prompt that's what I've got so far:

2015-09-27 23:33:10,606:ERROR:shell:segment_generator:Failed to generate segment from {u'name': u'version', u'module': u'powerlinex.segment.rbenv'}: u'function'
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/powerline/segment.py", line 328, in get
    contents, _contents_func, module, function_name, name = get_segment_info(data, segment)
  File "/usr/local/lib/python2.7/site-packages/powerline/segment.py", line 62, in get_function
    function_name = segment['function']
KeyError: u'function'

What am I doing wrong?
Please help me to figure out how to add this to my prompt
Thank you very much!!

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