Insync 3 - Unsupported file type error

  • Version : - Xenial Amd64
  • OS: Gnu/Linux Mint 16

I am trying to sync my Org mode files (txt files with .org suffix) and when I save the file the following error occurs:
Unexpected error doing AddCloudItem: (‘Unsupported file type: %r’, ‘L’)

It provides me the action to Retry, but sometimes it works, sometimes, it doesn’t and shows the same error. Just a little bit earlier I lost completely my org file, and I was forced to retrieved it from history two day ago, since the most recent one, were just empty files.

Any idea why this is happening?