title: How to override validation error messages for file upload class in CI?
body: <p>I have a form which has max size limit for attachment when user tries to upload is 10MB ( in my Case). When i try to upload more than that CI redirecting to the form with error message "select a file to upload". But i want error message like this "upload a file which is lesser size than 10MB". How should i over write that error message.</p>
  
  <p>Note: I am using CodeIgniter file upload class entirely..........</p>