ApiInfusionsoft error "undefined method `api_perform' for nil:NilClass"

api_infusionsoft.rb

# config/initializers/api_infusionsoft.rb
# actual file contains reall app and key values.
ApiInfusionsoft.set_account_apiconn("MYAPP.infusionsoft.com", "MYKEY")

UsersController.rb

class UsersController < ApplicationController
  
  include ApiInfusionsoft
  
  def index
    @users = User.all
    
    infuser = api_data_query(:Contact,1,0,{:Id=>3674}, ["Id", "FirstName", "LastName"])
    print "\n infuser #{infuser.inspect}"

    respond_to do |format|
      format.html # index.html.erb
      format.xml  { render :xml => @users }
    end
  end
  
  # other methods rm'd for this example.

end

Basically, the error is called from the following type of method cal in the ApiInfusionsoft plugin. It doesn't matter what method is called, because Thread.current[:api_conn] is returning nil.

Thread.current[:api_conn].api_perform('DataService', 'load', table, id, selected_fields)

Here are the relevant lines from the error message:

NoMethodError in UsersController#index
undefined method `api_perform' for nil:NilClass

vendor/plugins/api_infusionsoft/lib/api_infusionsoft.rb:247:in `api_data_query'

Hello.. I'll check it out, and respond later this evening.