Autosave Not Working
Autosave module works fine with a multilingual Drupal site. 

So I'm assuming that you are working on a single language Drupal site. 

In order to make Autosave module work on single language Drupal site, you need to apply this patch file

Edit: 

The patch file should be for Autosave 7.x-2.x-dev

Check the actual issue