rails 3.2 NoMethodError undefined method `slice' for nil:NilClass -

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i getting error end have no clue how fix it. weird thing is, working before. think after run annotate, broken, not sure. error comes confs.controller index , own methods. rejects this: conf.machine_brand[0,1].upcase nomethoderror [ ] bla bla conf model:

# == schema information # # table name: confs # #  id                 :integer          not null, primary key #  machine_brand      :string(255) #  machine_model      :string(255) #  control_unit_brand :string(255) #  control_unit_model :string(255) #  tool_axis_x        :decimal(, ) #  tool_axis_y        :decimal(, ) #  tool_axis_z        :decimal(, ) #  rotary_axis_number :integer #  linear_axis_number :integer #  turning_mode       :boolean #  milling_mode       :boolean #  description        :text #  xml                :text #  user_id            :integer #  developer_id       :integer #  created_at         :datetime         not null #  updated_at         :datetime         not null #  class conf < activerecord::base    attr_accessible :linear_axis_number, :control_unit_brand, :control_unit_model, :description, :developer_id, :machine_brand, :machine_model, :milling_mode, :rotary_axis_number, :tool_axis_x, :tool_axis_y, :tool_axis_z, :turning_mode, :user_id, :xml      belongs_to :developer, :class_name => 'user', :foreign_key => 'developer_id'    belongs_to :receiver, :class_name => 'user', :foreign_key => 'user_id'     validates :user_id, presence: true    validates :developer_id, presence: true end

this confs.controller:

class confscontroller < applicationcontroller before_filter  :signed_in_user, only:[:index, :edit, :update, :destroy] before_filter  :developer_user, only: :destroy  def new   @conf = conf.new end  def index   @grouped = {}   conf.all.each |conf|     letter = conf.machine_brand.slice(0,1).upcase     @grouped[letter] ||= []     @grouped[letter] << conf end end  def show @conf = conf.find(params[:id])  respond_to |format|     format.html #index.html.erb     format.json { render json: @conf }     format.xml { render xml: @conf }     end end  def own   @grouped = {}   conf.where(:developer_id => current_user.id).each |conf|     letter = conf.machine_brand.slice(0,1).upcase     @grouped[letter] ||= []     @grouped[letter] << conf   end end  def create @conf = conf.new(conf_params)    if @conf.save     flash[:success] = "new configuration uploaded!"     redirect_to conf_show_path   else     flash[:error] = "there problem!"     render 'new'   end end  def destroy   @conf = conf.find(params[:id]).destroy   redirect_to conf_show_own_path end  def update   @conf.update_attributes(params[:conf])   end  private  def signed_in_user   unless signed_in?     store_location     redirect_to signin_url, notice: "please sign in"       end end  def admin_user   redirect_to(root_path) unless current_user.admin? end  def developer_user   redirect_to(root_path) unless current_user.developer? end  def conf_params   params.require(:conf).permit(:xml, :user_id, :developer_id) if params[:conf] end  end

and conf.new if wish:

<% provide(:title, 'new configuration')%> <h1> upload new configuration </h1>  <div class="row">   <div class="span6 offset3">       <%= form_for @conf, :html => {:multipart => true} |f| %>      <%= f.label :machine_brand %>     <%= f.text_field :machine_brand %>      <%= f.label :machine_model %>     <%= f.text_field :machine_model %>      <%= f.label :control_unit_brand %>     <%= f.text_field :control_unit_brand %>      <%= f.label :control_unit_model %>     <%= f.text_field :control_unit_model %>      <%= f.label :tool_axis_x %>     <%= f.text_field :tool_axis_x %>      <%= f.label :tool_axis_y %>     <%= f.text_field :tool_axis_y %>      <%= f.label :tool_axis_z %>     <%= f.text_field :tool_axis_z %>      <%= f.label :rotary_axis_number %>     <%= f.text_field :rotary_axis_number %>      <%= f.label :linear_axis_number %>     <%= f.text_field :linear_axis_number %>      <%= f.label :turning_mode %>     <%= f.text_field :turning_mode %>      <%= f.label :milling_mode %>     <%= f.text_field :milling_mode %>      <%= f.label :description %>     <%= f.text_field :description %>      <%= f.label :xml %>     <%= f.text_field :xml %>      <%= f.label :client %>     <%= f.collection_select :user_id, user.where(:admin => false, :developer => false), :id, :name, options ={:prompt => "select client"}, :class =>"user" %>      <%= f.label :me %>     <%= f.collection_select :developer_id, user.where(:id => current_user.id), :id, :name, options ={:prompt => "select me"}, :class =>"user" %>  <br />     <%= f.submit "upload", class: "btn btn-large btn-primary" %> <% end %>   </div> </div>

conf.machine_brand.slice(0,1)
think got error here machine_brand in controller
letter = params[:machine_brand].to_s.slice(0,1).upcase unless params[:machine_brand].blank?
or
letter = params[:conf][:machine_brand].to_s.slice(0,1).upcase unless params[:machine_brand].blank?


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