Leash Ring not found error

If you get an error that the "Leash Ring" is not found, it probably means there's an SL asset server error.

1. Get a fresh Key Box from your sub (HUD Menu > take keys), or

2. Ask your sub to get a fresh HUD (HUD Menu > HELP... > New HUD...), wear that (no need to transfer anything - she can rewear the older HUD again after this), and then get a fresh Key Box (see 1. above). 

Didn't give Leash Ring

If you are given keys but not the Leash Ring, it means that your Key Box is an earlier version that doesn't have it. 

1. Get your sub to update her Collar. 
2. Then take keys again.