I've never tried those instructions - instead, I'm using this community app to handle all of my Blue LED actions, and it's been flawless.
Unfortunately, I haven't seen the dev (@jonathanb) active in the community lately, so I sincerely hope all is well with him - Jonathan has made some really awesome apps & drivers for the community here, so I hope he'll be back again soon!
If you look in the driver code the startNotification has been commented out with a note that you can uncomment for backward compatibility. So there are a couple of options: