title: Ruby on rails - Permission denied @ dir_s_mkdir - /essets
body: <p>I'm working on a sales site, and added paperclip to add images to these products but however much I try I can not get this error please help me (sorry if I'm writing this wrong from Brazil)</p>
  
  <p>Errno::EACCES in AdsController#create
  Permission denied @ dir_s_mkdir - /essets</p>
  
  <p>'(Extracted source (around line #33):)'</p>
  
  <pre><code>respond_to do |format|
    if @ad.save
      format.html { redirect_to @ad, notice: 'Ad was successfully created.' }
      format.json { render :show, status: :created, location: @ad }
    else
  </code></pre>