New to rails with a plugin question

Hey Everybody, i am trying to use the rails plugin ym4r_gm and nothing
i do seems to be working, and the error i am getting looks like rails
isn’t seeing the plugin.
here is the error message:
NoMethodError in Content_pages#view_default

Showing app/views/layouts/application.rhtml where line #14 raised:
You have a nil object when you didn’t expect it!
The error occurred while evaluating nil.to_html

Extracted source (around line #14):
11:
12: <%= stylesheet_link_tag “style”, :media => “all” %>
13: <%= GMap.header %>
14: <%= @map.to_html %>
15:
16:
17:

RAILS_ROOT: script/…/config/…
Application Trace | Framework Trace | Full Trace
#{RAILS_ROOT}/app/views/layouts/application.rhtml:14:in
`_run_rhtml_47app47views47layouts47application46rhtml’

if anybody could help me that would be awesome, i am stumped.

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