Levels lock crash

I can't seem to test one of the latest features, RE: Lock

Each time I apply the lock and test, BB2 crashes.

I'm using OS X el Capitan

 

OK the crashes stopped for now, now I can't seem to understand how to set the levels lock.
@Andy @TreySmith Please help.

 

Hi @Kadri246
add the lock button
add image menu in the lock setup
add image locked menu
change for in game currency and add the price
select menu in the field
then in the node view link the "lock button" to the game field of your choice
et voila
should work...

 

Thanks @viking, but I got it working after trying all possibilities for so long. The only problem is that during testing within the simulator, the unlocked levels are locked again if the character dies again. How do I keep the levels unlocked?
My levels aren't for purchase, my levels are unlocked as the previous has been completed. They do unlock but when the character die, it locks again after navigating to the main menu then replaying.

My setup is quite different, so I have to use logic unlock as well to observe last scene, somehow it doesn't observe for too long. it sleeps.

 

Here's my mind map, well some of it..

 

OK, I managed to get it fixed, but with my setup it becomes more complex and requires more than just adding lock buttons.