title: Codeigniter error: The filetype you are attempting to upload is not allowed
body: <p>If I upload a <code>csv</code> file, there is no problem on <code>localhost</code> and everything works fine, but when I upload my app on live server and upload a <code>csv</code> file then this error thrown: <code>The filetype you are attempting to upload is not allowed.</code> I am confused as to why this happens. Please help me to solve this.</p>
  
  <p>For my <code>localhost</code> environment, I am using XAMPP and CodeIgniter.</p>
  
  <p>I only want to allow <code>csv</code> file uploads.</p>