You get this error when trying to update the signature for Apple Mail in Mac OS:


Please try creating a signature in Apple Mail manually in the following way:


  1. Start Apple Mail.
  2. Press Cmd + ',' to open the settings.
  3. Click "Signatures".
  4. Create a signature by clicking the '+' button and enter some test.
  5. Close the signatures dialog.
  6. Quit Apple Mail by pressing Cmd + 'Q'.


Run the "Update all signatures" from the Xink menu.  


If you are still getting the error please check your iCloud settings as described here:

http://support.xink.io/support/solutions/articles/1000227905-setting-up-your-icloud-drive-for-the-mac-os-xink-app