Here is the list of causes and solutions to resolve this issue:

  • PDF file is not in a virtual directory
  • Missing Adobe Reader plug-in
  • Older version of browser application
  • Older web server version that handles PDF (or other files types) incorrectly
  • PDF file get damaged

Try following soluttions to fix this issue:

  • Disable view in browser feature
  • Check if any problem with web server
  • Download PDF to local drive
  • Install Adobe Acrobat viewer