Rails 3 Action Mailer uninitialized constant

I'm trying to use actionmailer to notify me when a new comment has been posted but I keep getting the error: ``` uninitialized constant CommentsController::CommentMailer ``` The comment is added to my database and can be viewed. I am also using devise and it's email functions are working fine. My comment mailer: ``` class CommentMailer < ActionMailer::Base def newcomment(comment) mail(:to => "admin@example.com", :subject => "New Comment") end end ``` and my controller section: ``` def create @comment = Comment.new(params[:comment]) @comment.user_id = current_user.id respond_to do |format| if @comment.save CommentMailer.newcomment(@comment).deliver format.html { redirect_to @comment, notice: 'Comment was successfully created!' } format.json { render json: @comment, status: :created, location: @comment } else format.html { render action: "new" } format.json { render json: @comment.errors, status: :unprocessable_entity } end end end ```